{
    "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-2026-3731",
        "tracking": {
            "current_release_date": "2026-03-27T01:27:15.277078Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-3731",
            "initial_release_date": "2026-03-08T10:38:40.001365Z",
            "revision_history": [
                {
                    "date": "2026-03-08T10:38:40.001365Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (6).| CWES updated (1)."
                },
                {
                    "date": "2026-03-08T10:38:46.486273Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-08T11:24:45.802311Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (6).| CWES updated (1)."
                },
                {
                    "date": "2026-03-08T11:24:52.799835Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-08T14:48:02.588563Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-08T14:48:19.569882Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-09T10:22:05.319909Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2).| References created (4)."
                },
                {
                    "date": "2026-03-09T10:22:08.633339Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-09T12:27:38.103759Z",
                    "number": "9",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (12).| Product Identifiers created (6).| Product Remediations created (12).| References created (8).| CWES updated (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-03-09T18:43:10.983570Z",
                    "number": "10",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)."
                },
                {
                    "date": "2026-03-09T18:43:13.141351Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-09T19:26:53.837308Z",
                    "number": "12",
                    "summary": "Products created (1).| Product Identifiers created (1)."
                },
                {
                    "date": "2026-03-09T19:26:56.969096Z",
                    "number": "13",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-11T12:19:43.581923Z",
                    "number": "14",
                    "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| CWES updated (1)."
                },
                {
                    "date": "2026-03-11T12:19:56.678433Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-11T20:38:55.135364Z",
                    "number": "16",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-11T20:38:59.122696Z",
                    "number": "17",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-12T10:00:30.832287Z",
                    "number": "18",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (6)."
                },
                {
                    "date": "2026-03-14T00:21:38.736251Z",
                    "number": "19",
                    "summary": "Products created (2).| Product Identifiers created (2)."
                },
                {
                    "date": "2026-03-14T00:21:40.405468Z",
                    "number": "20",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-18T09:24:56.895599Z",
                    "number": "21",
                    "summary": "Products connected (1).| Product Identifiers created (1).| References created (1)."
                },
                {
                    "date": "2026-03-18T09:25:03.970084Z",
                    "number": "22",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:28:05.479337Z",
                    "number": "23",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-20T09:28:08.318049Z",
                    "number": "24",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T18:30:25.518035Z",
                    "number": "25",
                    "summary": "Product Remediations created (1)."
                },
                {
                    "date": "2026-03-20T18:30:45.168787Z",
                    "number": "26",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T18:36:37.922356Z",
                    "number": "27",
                    "summary": "Product Remediations removed (1)."
                },
                {
                    "date": "2026-03-20T18:36:41.408255Z",
                    "number": "28",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-21T12:19:47.196048Z",
                    "number": "29",
                    "summary": "Product Remediations created (1)."
                },
                {
                    "date": "2026-03-21T12:19:49.498513Z",
                    "number": "30",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-25T10:10:22.837486Z",
                    "number": "31",
                    "summary": "Products connected (1).| Product Identifiers created (1).| References created (1)."
                },
                {
                    "date": "2026-03-25T10:10:27.591655Z",
                    "number": "32",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-25T18:11:05.894466Z",
                    "number": "33",
                    "summary": "CVSS updated.| Products connected (2).| Products created (1)."
                },
                {
                    "date": "2026-03-25T18:11:18.545329Z",
                    "number": "34",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T01:27:13.553867Z",
                    "number": "35",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "35"
        }
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    "vulnerabilities": [
        {
            "cve": "CVE-2026-3731",
            "cwe": {
                "id": "CWE-125",
                "name": "Out-of-bounds Read"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-3731"
                },
                {
                    "category": "description",
                    "text": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-3731"
                },
                {
                    "category": "description",
                    "text": "A flaw was found in libssh. A remote attacker could trigger an out-of-bounds read vulnerability in the SFTP Extension Name Handler by manipulating the `idx` argument in the `sftp_extensions_get_name` or `sftp_extensions_get_data` functions. This could lead to a Denial of Service (DoS), making the affected system unresponsive.\nA MODERATE impact out-of-bounds read vulnerability exists in libssh's SFTP extension. A remote attacker could exploit this flaw by manipulating an argument to the `sftp_extensions_get_name/sftp_extensions_get_data` functions, potentially leading to a denial of service or information disclosure. This affects Red Hat Enterprise Linux versions utilizing libssh.",
                    "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-3731"
                },
                {
                    "category": "description",
                    "text": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-3731"
                },
                {
                    "category": "description",
                    "text": "libssh SFTP Extension Name sftp.c sftp\\_extensions\\_get\\_data out-of-bounds",
                    "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "description",
                    "text": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-3731.json?alt=media"
                },
                {
                    "category": "other",
                    "text": "0.00099",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X",
                    "title": "CVSSV4"
                },
                {
                    "category": "other",
                    "text": "6.9",
                    "title": "CVSSV4 base score"
                },
                {
                    "category": "other",
                    "text": "4.6",
                    "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": "Is related to a product by vendor Debian, The value of the most recent EPSS score, There is product data available from source Debian",
                    "title": "NCSC Score top decreasing factors"
                },
                {
                    "category": "details",
                    "text": "Severity: 2\n",
                    "title": "Vendor assessment"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5628998",
                    "CSAFPID-5628999",
                    "CSAFPID-1439315",
                    "CSAFPID-1439317",
                    "CSAFPID-1439319",
                    "CSAFPID-1439321",
                    "CSAFPID-1439328",
                    "CSAFPID-1439329",
                    "CSAFPID-2858634",
                    "CSAFPID-2936250",
                    "CSAFPID-2936251",
                    "CSAFPID-2936252",
                    "CSAFPID-3106288",
                    "CSAFPID-3106289",
                    "CSAFPID-2936260",
                    "CSAFPID-2936261",
                    "CSAFPID-5772330",
                    "CSAFPID-3378782",
                    "CSAFPID-3378788",
                    "CSAFPID-3689307",
                    "CSAFPID-5826708",
                    "CSAFPID-5826709",
                    "CSAFPID-1330299",
                    "CSAFPID-1317174",
                    "CSAFPID-3689308",
                    "CSAFPID-3711545",
                    "CSAFPID-5907161"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3731.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-3731"
                },
                {
                    "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-2026-0634.json"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/security/cve/CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Source raw - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-3731.json"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-3731"
                },
                {
                    "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-2026-3731.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://vuldb.com/?id.349709"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://vuldb.com/?ctiid.349709"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://vuldb.com/?submit.767120"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txt"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd; osv; redhat",
                    "url": "https://www.libssh.org/files/0.12/libssh-0.12.0.tar.xz"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0634.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0634"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445579"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3731"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://ubuntu.com/security/notices/USN-8093-1"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/024867.html"
                }
            ],
            "remediations": [
                {
                    "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-1439328",
                        "CSAFPID-1439329",
                        "CSAFPID-2858634",
                        "CSAFPID-2936250",
                        "CSAFPID-2936251",
                        "CSAFPID-2936252",
                        "CSAFPID-3106288",
                        "CSAFPID-3106289"
                    ]
                },
                {
                    "category": "vendor_fix",
                    "details": "CBL-Mariner Releases",
                    "product_ids": [
                        "CSAFPID-5826709"
                    ]
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "products": [
                        "CSAFPID-1317174",
                        "CSAFPID-1330299",
                        "CSAFPID-1439315",
                        "CSAFPID-1439317",
                        "CSAFPID-1439319",
                        "CSAFPID-1439321",
                        "CSAFPID-1439328",
                        "CSAFPID-1439329",
                        "CSAFPID-2858634",
                        "CSAFPID-2936250",
                        "CSAFPID-2936251",
                        "CSAFPID-2936252",
                        "CSAFPID-2936260",
                        "CSAFPID-2936261",
                        "CSAFPID-3106288",
                        "CSAFPID-3106289",
                        "CSAFPID-3378782",
                        "CSAFPID-3378788",
                        "CSAFPID-3689307",
                        "CSAFPID-3689308",
                        "CSAFPID-3711545",
                        "CSAFPID-5628998",
                        "CSAFPID-5628999",
                        "CSAFPID-5772330",
                        "CSAFPID-5826708",
                        "CSAFPID-5826709",
                        "CSAFPID-5907161"
                    ]
                }
            ],
            "title": "CVE-2026-3731"
        }
    ]
}