{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-2673",
        "tracking": {
            "current_release_date": "2026-03-26T06:14:58.711846Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-2673",
            "initial_release_date": "2026-01-30T08:29:04.754496Z",
            "revision_history": [
                {
                    "date": "2026-01-30T08:29:04.754496Z",
                    "number": "1",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-13T14:38:41.226282Z",
                    "number": "2",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (2).| References created (3).| CWES updated (1)."
                },
                {
                    "date": "2026-03-13T14:38:52.114192Z",
                    "number": "3",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-13T15:38:48.699720Z",
                    "number": "4",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-13T16:11:02.947469Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-13T18:43:42.003878Z",
                    "number": "6",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2)."
                },
                {
                    "date": "2026-03-13T18:47:47.487944Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (1).| Product Remediations created (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-03-13T18:47:53.916932Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-13T20:30:47.952628Z",
                    "number": "9",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4).| CWES updated (1)."
                },
                {
                    "date": "2026-03-13T20:30:54.313833Z",
                    "number": "10",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-14T00:27:53.438316Z",
                    "number": "11",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (14).| Product Identifiers created (6).| Product Remediations created (19).| Products created (5).| References created (5).| CWES updated (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-03-14T00:28:06.994179Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-14T06:43:50.533351Z",
                    "number": "13",
                    "summary": "Description created for source."
                },
                {
                    "date": "2026-03-14T14:57:42.135767Z",
                    "number": "14",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-14T14:57:52.743131Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-16T11:05:43.867751Z",
                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Products created (2).| References created (6)."
                },
                {
                    "date": "2026-03-16T11:05:46.186355Z",
                    "number": "17",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-17T12:19:56.553531Z",
                    "number": "18",
                    "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-17T12:19:59.216955Z",
                    "number": "19",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-17T18:25:15.840403Z",
                    "number": "20",
                    "summary": "CVSS created."
                },
                {
                    "date": "2026-03-17T18:25:20.414647Z",
                    "number": "21",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-17T18:38:52.273725Z",
                    "number": "22",
                    "summary": "CVSS created.| Unknown change."
                },
                {
                    "date": "2026-03-17T18:38:54.583229Z",
                    "number": "23",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-19T12:10:49.431558Z",
                    "number": "24",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (69).| Products created (2).| References created (4)."
                },
                {
                    "date": "2026-03-19T12:10:58.350373Z",
                    "number": "25",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:43:29.772520Z",
                    "number": "26",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-20T09:43:33.056640Z",
                    "number": "27",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T18:22:00.437040Z",
                    "number": "28",
                    "summary": "Products created (1).| Product Identifiers created (1)."
                },
                {
                    "date": "2026-03-20T18:22:04.880546Z",
                    "number": "29",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T18:36:36.560636Z",
                    "number": "30",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| Product Threats created (2).| Vendor_assessment created."
                },
                {
                    "date": "2026-03-20T18:36:39.714518Z",
                    "number": "31",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-22T10:41:58.456257Z",
                    "number": "32",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-24T20:48:00.755595Z",
                    "number": "33",
                    "summary": "Description removed for source.| Description created for source.| Products created (1).| Product Threats created (1).| Products removed (2)."
                },
                {
                    "date": "2026-03-24T20:48:07.655567Z",
                    "number": "34",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "34"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:netapp/>=3.5.0-alpha1|<=3.5.5|>=3.6.0-alpha1|<=3.6.1",
                                "product": {
                                    "name": "vers:netapp/>=3.5.0-alpha1|<=3.5.5|>=3.6.0-alpha1|<=3.6.1",
                                    "product_id": "CSAFPID-5902287"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Multiple  products incorporating OpenSSL"
                    }
                ],
                "category": "vendor",
                "name": "NetApp"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<3.5.6",
                                "product": {
                                    "name": "vers:unknown/<3.5.6",
                                    "product_id": "CSAFPID-5829290"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<3.6.2",
                                "product": {
                                    "name": "vers:unknown/<3.6.2",
                                    "product_id": "CSAFPID-5829291"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "OpenSSL"
                    }
                ],
                "category": "vendor",
                "name": "Open Source"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/3.5.0|<3.5.6",
                                "product": {
                                    "name": "vers:semver/3.5.0|<3.5.6",
                                    "product_id": "CSAFPID-5814651"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/3.6.0|<3.6.2",
                                "product": {
                                    "name": "vers:semver/3.6.0|<3.6.2",
                                    "product_id": "CSAFPID-5814650"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/>=3.5|<3.5.6|>=3.6|<3.6.2",
                                "product": {
                                    "name": "vers:unknown/>=3.5|<3.5.6|>=3.6|<3.6.2",
                                    "product_id": "CSAFPID-5815377"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "OpenSSL"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/3.5-post-clang-format-webkit",
                                "product": {
                                    "name": "vers:unknown/3.5-post-clang-format-webkit",
                                    "product_id": "CSAFPID-5490268"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/3.5-pre-clang-format-webkit",
                                "product": {
                                    "name": "vers:unknown/3.5-pre-clang-format-webkit",
                                    "product_id": "CSAFPID-5490269"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/3.6-post-clang-format-webkit",
                                "product": {
                                    "name": "vers:unknown/3.6-post-clang-format-webkit",
                                    "product_id": "CSAFPID-5490270"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/3.6-pre-clang-format-webkit",
                                "product": {
                                    "name": "vers:unknown/3.6-pre-clang-format-webkit",
                                    "product_id": "CSAFPID-5490271"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/before_engine",
                                "product": {
                                    "name": "vers:unknown/before_engine",
                                    "product_id": "CSAFPID-3155837"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/master-post-auto-reformat",
                                "product": {
                                    "name": "vers:unknown/master-post-auto-reformat",
                                    "product_id": "CSAFPID-3191424"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/master-post-reformat",
                                "product": {
                                    "name": "vers:unknown/master-post-reformat",
                                    "product_id": "CSAFPID-3191425"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/master-pre-auto-reformat",
                                "product": {
                                    "name": "vers:unknown/master-pre-auto-reformat",
                                    "product_id": "CSAFPID-3191426"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/master-pre-reformat",
                                "product": {
                                    "name": "vers:unknown/master-pre-reformat",
                                    "product_id": "CSAFPID-3191427"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha1",
                                    "product_id": "CSAFPID-3442503"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha10",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha10",
                                    "product_id": "CSAFPID-3442504"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha11",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha11",
                                    "product_id": "CSAFPID-3442505"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha12",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha12",
                                    "product_id": "CSAFPID-3442506"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha13",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha13",
                                    "product_id": "CSAFPID-3442507"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha14",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha14",
                                    "product_id": "CSAFPID-3442508"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha15",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha15",
                                    "product_id": "CSAFPID-3442509"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha16",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha16",
                                    "product_id": "CSAFPID-3442510"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha17",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha17",
                                    "product_id": "CSAFPID-3442511"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha2",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha2",
                                    "product_id": "CSAFPID-3442512"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha3",
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                                    "name": "vers:unknown/openssl-3.0.0-alpha3",
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                                "category": "product_version_range",
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                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha5",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha5",
                                    "product_id": "CSAFPID-3442515"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha6",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha6",
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha7",
                                "product": {
                                    "name": "vers:unknown/openssl-3.0.0-alpha7",
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                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-alpha8",
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                                    "name": "vers:unknown/openssl-3.0.0-alpha8",
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                            },
                            {
                                "category": "product_version_range",
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                                    "name": "vers:unknown/openssl-3.0.0-alpha9",
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                            {
                                "category": "product_version_range",
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                                "product": {
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.0.0-beta2",
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                                    "name": "vers:unknown/openssl-3.0.0-beta2",
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                            },
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                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.2.0-alpha1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.2.0-alpha1",
                                    "product_id": "CSAFPID-3451713"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.2.0-alpha2",
                                "product": {
                                    "name": "vers:unknown/openssl-3.2.0-alpha2",
                                    "product_id": "CSAFPID-3451714"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.4.0-alpha1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.4.0-alpha1",
                                    "product_id": "CSAFPID-3773470"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.0",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.0",
                                    "product_id": "CSAFPID-3773471"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.0-alpha1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.0-alpha1",
                                    "product_id": "CSAFPID-3773472"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.0-beta1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.0-beta1",
                                    "product_id": "CSAFPID-3773473"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.1",
                                    "product_id": "CSAFPID-4626302"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.2",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.2",
                                    "product_id": "CSAFPID-4626303"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.3",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.3",
                                    "product_id": "CSAFPID-4950548"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.4",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.4",
                                    "product_id": "CSAFPID-5490274"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.5.5",
                                "product": {
                                    "name": "vers:unknown/openssl-3.5.5",
                                    "product_id": "CSAFPID-5850922"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.6.0",
                                "product": {
                                    "name": "vers:unknown/openssl-3.6.0",
                                    "product_id": "CSAFPID-5490275"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.6.0-alpha1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.6.0-alpha1",
                                    "product_id": "CSAFPID-5490276"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.6.0-beta1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.6.0-beta1",
                                    "product_id": "CSAFPID-5490277"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl-3.6.1",
                                "product": {
                                    "name": "vers:unknown/openssl-3.6.1",
                                    "product_id": "CSAFPID-5850923"
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                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openssl_0_9_1c",
                                "product": {
                                    "name": "vers:unknown/openssl_0_9_1c",
                                    "product_id": "CSAFPID-3155838"
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    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-2673",
            "cwe": {
                "id": "CWE-757",
                "name": "Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected\npreferred key exchange group when its key exchange group configuration includes\nthe default by using the 'DEFAULT' keyword.\n\nImpact summary: A less preferred key exchange may be used even when a more\npreferred group is supported by both client and server, if the group\nwas not included among the client's initial predicated keyshares.\nThis will sometimes be the case with the new hybrid post-quantum groups,\nif the client chooses to defer their use until specifically requested by\nthe server.\n\nIf an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to\ninterpolate the built-in default group list into its own configuration, perhaps\nadding or removing specific elements, then an implementation defect causes the\n'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups\nwere treated as a single sufficiently secure 'tuple', with the server not\nsending a Hello Retry Request (HRR) even when a group in a more preferred tuple\nwas mutually supported.\n\nAs a result, the client and server might fail to negotiate a mutually supported\npost-quantum key agreement group, such as 'X25519MLKEM768', if the client's\nconfiguration results in only 'classical' groups (such as 'X25519' being the\nonly ones in the client's initial keyshare prediction).\n\nOpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS\n1.3 key agreement group on TLS servers.  The old syntax had a single 'flat'\nlist of groups, and treated all the supported groups as sufficiently secure.\nIf any of the keyshares predicted by the client were supported by the server\nthe most preferred among these was selected, even if other groups supported by\nthe client, but not included in the list of predicted keyshares would have been\nmore preferred, if included.\n\nThe new syntax partitions the groups into distinct 'tuples' of roughly\nequivalent security.  Within each tuple the most preferred group included among\nthe client's predicted keyshares is chosen, but if the client supports a group\nfrom a more preferred tuple, but did not predict any corresponding keyshares,\nthe server will ask the client to retry the ClientHello (by issuing a Hello\nRetry Request or HRR) with the most preferred mutually supported group.\n\nThe above works as expected when the server's configuration uses the built-in\ndefault group list, or explicitly defines its own list by directly defining the\nvarious desired groups and group 'tuples'.\n\nNo OpenSSL FIPS modules are affected by this issue, the code in question lies\noutside the FIPS boundary.\n\nOpenSSL 3.6 and 3.5 are vulnerable to this issue.\n\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.\n\nOpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-2673"
                },
                {
                    "category": "description",
                    "text": "An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the \"DEFAULT\" keyword. A less preferred key exchange may be used even when a more preferred group is supported by both client and server, if the group was not included among the client's initial predicated keyshares. This will sometimes be the case with the new hybrid post-quantum groups, if the client chooses to defer their use until specifically requested by the server. If an OpenSSL TLS 1.3 server's configuration uses the \"DEFAULT\" keyword to interpolate the built-in default group list into its own configuration, perhaps adding or removing specific elements, then an implementation defect causes the \"DEFAULT\" list to lose its \"tuple\" structure, and all server-supported groups were treated as a single sufficiently secure \"tuple\", with the server not sending a Hello Retry Request (HRR) even when a group in a more preferred tuple was mutually supported. As a result, the client and server might fail to negotiate a mutually supported post-quantum key agreement group, such as \"X25519MLKEM768\", if the client's configuration results in only \"classical\" groups (such as \"X25519\" being the only ones in the client's initial keyshare prediction).",
                    "title": "openssl - https://openssl-library.org/news/secadv/20260313.txt"
                },
                {
                    "category": "description",
                    "text": "Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected\npreferred key exchange group when its key exchange group configuration includes\nthe default by using the 'DEFAULT' keyword.\n\nImpact summary: A less preferred key exchange may be used even when a more\npreferred group is supported by both client and server, if the group\nwas not included among the client's initial predicated keyshares.\nThis will sometimes be the case with the new hybrid post-quantum groups,\nif the client chooses to defer their use until specifically requested by\nthe server.\n\nIf an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to\ninterpolate the built-in default group list into its own configuration, perhaps\nadding or removing specific elements, then an implementation defect causes the\n'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups\nwere treated as a single sufficiently secure 'tuple', with the server not\nsending a Hello Retry Request (HRR) even when a group in a more preferred tuple\nwas mutually supported.\n\nAs a result, the client and server might fail to negotiate a mutually supported\npost-quantum key agreement group, such as 'X25519MLKEM768', if the client's\nconfiguration results in only 'classical' groups (such as 'X25519' being the\nonly ones in the client's initial keyshare prediction).\n\nOpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS\n1.3 key agreement group on TLS servers.  The old syntax had a single 'flat'\nlist of groups, and treated all the supported groups as sufficiently secure.\nIf any of the keyshares predicted by the client were supported by the server\nthe most preferred among these was selected, even if other groups supported by\nthe client, but not included in the list of predicted keyshares would have been\nmore preferred, if included.\n\nThe new syntax partitions the groups into distinct 'tuples' of roughly\nequivalent security.  Within each tuple the most preferred group included among\nthe client's predicted keyshares is chosen, but if the client supports a group\nfrom a more preferred tuple, but did not predict any corresponding keyshares,\nthe server will ask the client to retry the ClientHello (by issuing a Hello\nRetry Request or HRR) with the most preferred mutually supported group.\n\nThe above works as expected when the server's configuration uses the built-in\ndefault group list, or explicitly defines its own list by directly defining the\nvarious desired groups and group 'tuples'.\n\nNo OpenSSL FIPS modules are affected by this issue, the code in question lies\noutside the FIPS boundary.\n\nOpenSSL 3.6 and 3.5 are vulnerable to this issue.\n\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.\n\nOpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-2673"
                },
                {
                    "category": "description",
                    "text": "A key group selection preference flaw has been discovered in OpenSSL. An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the \"DEFAULT\" keyword. A less preferred key exchange may be used even when a more preferred group is supported by both client and server, if the group was not included among the client's initial predicated keyshares. This will sometimes be the case with the new hybrid post-quantum groups, if the client chooses to defer their use until specifically requested by the server. No OpenSSL FIPS modules are affected by this issue, the code in question lies outside the FIPS boundary.",
                    "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-2673"
                },
                {
                    "category": "description",
                    "text": "Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the 'DEFAULT' keyword.  Impact summary: A less preferred key exchange may be used even when a more preferred group is supported by both client and server, if the group was not included among the client's initial predicated keyshares. This will sometimes be the case with the new hybrid post-quantum groups, if the client chooses to defer their use until specifically requested by the server.  If an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to interpolate the built-in default group list into its own configuration, perhaps adding or removing specific elements, then an implementation defect causes the 'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups were treated as a single sufficiently secure 'tuple', with the server not sending a Hello Retry Request (HRR) even when a group in a more preferred tuple was mutually supported.  As a result, the client and server might fail to negotiate a mutually supported post-quantum key agreement group, such as 'X25519MLKEM768', if the client's configuration results in only 'classical' groups (such as 'X25519' being the only ones in the client's initial keyshare prediction).  OpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS 1.3 key agreement group on TLS servers.  The old syntax had a single 'flat' list of groups, and treated all the supported groups as sufficiently secure. If any of the keyshares predicted by the client were supported by the server the most preferred among these was selected, even if other groups supported by the client, but not included in the list of predicted keyshares would have been more preferred, if included.  The new syntax partitions the groups into distinct 'tuples' of roughly equivalent security.  Within each tuple the most preferred group included among the client's predicted keyshares is chosen, but if the client supports a group from a more preferred tuple, but did not predict any corresponding keyshares, the server will ask the client to retry the ClientHello (by issuing a Hello Retry Request or HRR) with the most preferred mutually supported group.  The above works as expected when the server's configuration uses the built-in default group list, or explicitly defines its own list by directly defining the various desired groups and group 'tuples'.  No OpenSSL FIPS modules are affected by this issue, the code in question lies outside the FIPS boundary.  OpenSSL 3.6 and 3.5 are vulnerable to this issue.  OpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released. OpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.  OpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-2673"
                },
                {
                    "category": "description",
                    "text": "OpenSSL TLS 1.3 server may choose unexpected key agreement group",
                    "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "description",
                    "text": "Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected\npreferred key exchange group when its key exchange group configuration includes\nthe default by using the 'DEFAULT' keyword.\n\nImpact summary: A less preferred key exchange may be used even when a more\npreferred group is supported by both client and server, if the group\nwas not included among the client's initial predicated keyshares.\nThis will sometimes be the case with the new hybrid post-quantum groups,\nif the client chooses to defer their use until specifically requested by\nthe server.\n\nIf an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to\ninterpolate the built-in default group list into its own configuration, perhaps\nadding or removing specific elements, then an implementation defect causes the\n'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups\nwere treated as a single sufficiently secure 'tuple', with the server not\nsending a Hello Retry Request (HRR) even when a group in a more preferred tuple\nwas mutually supported.\n\nAs a result, the client and server might fail to negotiate a mutually supported\npost-quantum key agreement group, such as 'X25519MLKEM768', if the client's\nconfiguration results in only 'classical' groups (such as 'X25519' being the\nonly ones in the client's initial keyshare prediction).\n\nOpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS\n1.3 key agreement group on TLS servers.  The old syntax had a single 'flat'\nlist of groups, and treated all the supported groups as sufficiently secure.\nIf any of the keyshares predicted by the client were supported by the server\nthe most preferred among these was selected, even if other groups supported by\nthe client, but not included in the list of predicted keyshares would have been\nmore preferred, if included.\n\nThe new syntax partitions the groups into distinct 'tuples' of roughly\nequivalent security.  Within each tuple the most preferred group included among\nthe client's predicted keyshares is chosen, but if the client supports a group\nfrom a more preferred tuple, but did not predict any corresponding keyshares,\nthe server will ask the client to retry the ClientHello (by issuing a Hello\nRetry Request or HRR) with the most preferred mutually supported group.\n\nThe above works as expected when the server's configuration uses the built-in\ndefault group list, or explicitly defines its own list by directly defining the\nvarious desired groups and group 'tuples'.\n\nNo OpenSSL FIPS modules are affected by this issue, the code in question lies\noutside the FIPS boundary.\n\nOpenSSL 3.6 and 3.5 are vulnerable to this issue.\n\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.\n\nOpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-2673.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "Multiple NetApp products incorporate OpenSSL. OpenSSL versions 3.6.0-alpha1 through 3.6.1 and 3.5.0-alpha1 through 3.5.5 are susceptible to a vulnerability which when successfully exploited could lead to addition or modification of data.",
                    "title": "netapp - https://security.netapp.com/advisory/ntap-20260320-0015"
                },
                {
                    "category": "other",
                    "text": "0.00045",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "4.3",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "VENDOR FIX as product remediation category, There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent CVSS (V3) score",
                    "title": "NCSC Score top decreasing factors"
                },
                {
                    "category": "details",
                    "text": "Severity: 1\n",
                    "title": "Vendor assessment"
                },
                {
                    "category": "details",
                    "text": "Severity: 1\n",
                    "title": "Vendor assessment"
                },
                {
                    "category": "details",
                    "text": "Severity: 2\n",
                    "title": "Vendor assessment"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5814650",
                    "CSAFPID-5814651",
                    "CSAFPID-5815377",
                    "CSAFPID-1439315",
                    "CSAFPID-1439317",
                    "CSAFPID-1439319",
                    "CSAFPID-1439321",
                    "CSAFPID-1439326",
                    "CSAFPID-1832801",
                    "CSAFPID-1832802",
                    "CSAFPID-1832804",
                    "CSAFPID-1832806",
                    "CSAFPID-1832807",
                    "CSAFPID-1832810",
                    "CSAFPID-1832812",
                    "CSAFPID-2858634",
                    "CSAFPID-3010676",
                    "CSAFPID-5826734",
                    "CSAFPID-5826735",
                    "CSAFPID-5826736",
                    "CSAFPID-5826737",
                    "CSAFPID-5826738",
                    "CSAFPID-5829290",
                    "CSAFPID-5829291",
                    "CSAFPID-5775819",
                    "CSAFPID-5775820",
                    "CSAFPID-3155837",
                    "CSAFPID-3155838",
                    "CSAFPID-3155839",
                    "CSAFPID-3155840",
                    "CSAFPID-3155841",
                    "CSAFPID-3155842",
                    "CSAFPID-3155843",
                    "CSAFPID-3155844",
                    "CSAFPID-3155845",
                    "CSAFPID-3155846",
                    "CSAFPID-3155847",
                    "CSAFPID-3155848",
                    "CSAFPID-3155849",
                    "CSAFPID-3191406",
                    "CSAFPID-3191407",
                    "CSAFPID-3191408",
                    "CSAFPID-3191409",
                    "CSAFPID-3191410",
                    "CSAFPID-3191411",
                    "CSAFPID-3191424",
                    "CSAFPID-3191425",
                    "CSAFPID-3191426",
                    "CSAFPID-3191427",
                    "CSAFPID-3442492",
                    "CSAFPID-3442493",
                    "CSAFPID-3442494",
                    "CSAFPID-3442495",
                    "CSAFPID-3442496",
                    "CSAFPID-3442497",
                    "CSAFPID-3442498",
                    "CSAFPID-3442499",
                    "CSAFPID-3442500",
                    "CSAFPID-3442501",
                    "CSAFPID-3442503",
                    "CSAFPID-3442504",
                    "CSAFPID-3442505",
                    "CSAFPID-3442506",
                    "CSAFPID-3442507",
                    "CSAFPID-3442508",
                    "CSAFPID-3442509",
                    "CSAFPID-3442510",
                    "CSAFPID-3442511",
                    "CSAFPID-3442512",
                    "CSAFPID-3442513",
                    "CSAFPID-3442514",
                    "CSAFPID-3442515",
                    "CSAFPID-3442516",
                    "CSAFPID-3442517",
                    "CSAFPID-3442518",
                    "CSAFPID-3442519",
                    "CSAFPID-3442520",
                    "CSAFPID-3442521",
                    "CSAFPID-3451713",
                    "CSAFPID-3451714",
                    "CSAFPID-3773470",
                    "CSAFPID-3773471",
                    "CSAFPID-3773472",
                    "CSAFPID-3773473",
                    "CSAFPID-4626302",
                    "CSAFPID-4626303",
                    "CSAFPID-4950548",
                    "CSAFPID-5490268",
                    "CSAFPID-5490269",
                    "CSAFPID-5490270",
                    "CSAFPID-5490271",
                    "CSAFPID-5490274",
                    "CSAFPID-5490275",
                    "CSAFPID-5490276",
                    "CSAFPID-5490277",
                    "CSAFPID-5850922",
                    "CSAFPID-5850923",
                    "CSAFPID-5874046",
                    "CSAFPID-5902287"
                ],
                "known_not_affected": [
                    "CSAFPID-2000251",
                    "CSAFPID-2000252"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/2xxx/CVE-2026-2673.json"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source - openssl",
                    "url": "https://openssl-library.org/news/secadv/20260313.txt"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/security/cve/CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source raw - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2673.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0729.json"
                },
                {
                    "category": "external",
                    "summary": "Source - microsoft",
                    "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-2673.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - netapp",
                    "url": "https://security.netapp.com/advisory/ntap-20260320-0015"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; cveprojectv5; nvd; osv; redhat",
                    "url": "https://openssl-library.org/news/secadv/20260313.txt"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://github.com/openssl/openssl/commit/2157c9d81f7b0bd7dfa25b960e928ec28e8dd63f"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://github.com/openssl/openssl/commit/85977e013f32ceb96aa034c0e741adddc1a05e34"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv",
                    "url": "http://www.openwall.com/lists/oss-security/2026/03/13/3"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2673"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0729.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0729"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://openssl-library.org/news/vulnerabilities/"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447327"
                }
            ],
            "remediations": [
                {
                    "category": "vendor_fix",
                    "details": "OpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released. OpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released. The fix is also available in commit 2157c9d8 (for 3.6) and commit 85977e01 (for 3.5) in the OpenSSL git repository.",
                    "product_ids": [
                        "CSAFPID-5815377"
                    ]
                },
                {
                    "category": "mitigation",
                    "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
                    "product_ids": [
                        "CSAFPID-1439315",
                        "CSAFPID-1439317",
                        "CSAFPID-1439319",
                        "CSAFPID-1439321",
                        "CSAFPID-1439326",
                        "CSAFPID-1832801",
                        "CSAFPID-1832802",
                        "CSAFPID-1832804",
                        "CSAFPID-1832806",
                        "CSAFPID-1832807",
                        "CSAFPID-1832810",
                        "CSAFPID-1832812",
                        "CSAFPID-2858634",
                        "CSAFPID-3010676",
                        "CSAFPID-5826734",
                        "CSAFPID-5826735",
                        "CSAFPID-5826736",
                        "CSAFPID-5826737",
                        "CSAFPID-5826738"
                    ]
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "products": [
                        "CSAFPID-1439315",
                        "CSAFPID-1439317",
                        "CSAFPID-1439319",
                        "CSAFPID-1439321",
                        "CSAFPID-1439326",
                        "CSAFPID-1832801",
                        "CSAFPID-1832802",
                        "CSAFPID-1832804",
                        "CSAFPID-1832806",
                        "CSAFPID-1832807",
                        "CSAFPID-1832810",
                        "CSAFPID-1832812",
                        "CSAFPID-2858634",
                        "CSAFPID-3010676",
                        "CSAFPID-3155837",
                        "CSAFPID-3155838",
                        "CSAFPID-3155839",
                        "CSAFPID-3155840",
                        "CSAFPID-3155841",
                        "CSAFPID-3155842",
                        "CSAFPID-3155843",
                        "CSAFPID-3155844",
                        "CSAFPID-3155845",
                        "CSAFPID-3155846",
                        "CSAFPID-3155847",
                        "CSAFPID-3155848",
                        "CSAFPID-3155849",
                        "CSAFPID-3191406",
                        "CSAFPID-3191407",
                        "CSAFPID-3191408",
                        "CSAFPID-3191409",
                        "CSAFPID-3191410",
                        "CSAFPID-3191411",
                        "CSAFPID-3191424",
                        "CSAFPID-3191425",
                        "CSAFPID-3191426",
                        "CSAFPID-3191427",
                        "CSAFPID-3442492",
                        "CSAFPID-3442493",
                        "CSAFPID-3442494",
                        "CSAFPID-3442495",
                        "CSAFPID-3442496",
                        "CSAFPID-3442497",
                        "CSAFPID-3442498",
                        "CSAFPID-3442499",
                        "CSAFPID-3442500",
                        "CSAFPID-3442501",
                        "CSAFPID-3442503",
                        "CSAFPID-3442504",
                        "CSAFPID-3442505",
                        "CSAFPID-3442506",
                        "CSAFPID-3442507",
                        "CSAFPID-3442508",
                        "CSAFPID-3442509",
                        "CSAFPID-3442510",
                        "CSAFPID-3442511",
                        "CSAFPID-3442512",
                        "CSAFPID-3442513",
                        "CSAFPID-3442514",
                        "CSAFPID-3442515",
                        "CSAFPID-3442516",
                        "CSAFPID-3442517",
                        "CSAFPID-3442518",
                        "CSAFPID-3442519",
                        "CSAFPID-3442520",
                        "CSAFPID-3442521",
                        "CSAFPID-3451713",
                        "CSAFPID-3451714",
                        "CSAFPID-3773470",
                        "CSAFPID-3773471",
                        "CSAFPID-3773472",
                        "CSAFPID-3773473",
                        "CSAFPID-4626302",
                        "CSAFPID-4626303",
                        "CSAFPID-4950548",
                        "CSAFPID-5490268",
                        "CSAFPID-5490269",
                        "CSAFPID-5490270",
                        "CSAFPID-5490271",
                        "CSAFPID-5490274",
                        "CSAFPID-5490275",
                        "CSAFPID-5490276",
                        "CSAFPID-5490277",
                        "CSAFPID-5775819",
                        "CSAFPID-5775820",
                        "CSAFPID-5814650",
                        "CSAFPID-5814651",
                        "CSAFPID-5815377",
                        "CSAFPID-5826734",
                        "CSAFPID-5826735",
                        "CSAFPID-5826736",
                        "CSAFPID-5826737",
                        "CSAFPID-5826738",
                        "CSAFPID-5829290",
                        "CSAFPID-5829291",
                        "CSAFPID-5850922",
                        "CSAFPID-5850923",
                        "CSAFPID-5874046",
                        "CSAFPID-5902287"
                    ]
                }
            ],
            "threats": [
                {
                    "category": "impact",
                    "details": "Successful exploitation of this vulnerability could lead to addition or modification of data.",
                    "product_ids": [
                        "CSAFPID-5902287"
                    ]
                }
            ],
            "title": "CVE-2026-2673"
        }
    ]
}