{
    "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-2026-4747",
        "tracking": {
            "current_release_date": "2026-04-01T16:19:52.667202Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-4747",
            "initial_release_date": "2026-03-26T07:25:34.699448Z",
            "revision_history": [
                {
                    "date": "2026-03-26T07:25:34.699448Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T07:25:38.760664Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-26T07:38:44.917919Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (3).| Products created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T07:38:55.421268Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T11:34:54.833808Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T13:06:18.331072Z",
                    "number": "6",
                    "summary": "Source connected.| CVE status created. (valid)| Products connected (3).| References created (6)."
                },
                {
                    "date": "2026-03-26T13:06:20.057230Z",
                    "number": "7",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T14:26:24.446471Z",
                    "number": "8",
                    "summary": "CVSS created."
                },
                {
                    "date": "2026-03-26T14:26:32.691523Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T14:39:12.158479Z",
                    "number": "10",
                    "summary": "CVSS created.| Unknown change."
                },
                {
                    "date": "2026-03-26T14:39:14.548987Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T14:57:34.148878Z",
                    "number": "12",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-26T14:57:44.777360Z",
                    "number": "13",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T15:02:50.517240Z",
                    "number": "14",
                    "summary": "EPSS updated."
                },
                {
                    "date": "2026-04-01T15:02:59.016704Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T15:36:25.902670Z",
                    "number": "16",
                    "summary": "References created (2)."
                },
                {
                    "date": "2026-04-01T15:54:09.990112Z",
                    "number": "17",
                    "summary": "Exploits created (1).| References created (1).| Unknown change."
                },
                {
                    "date": "2026-04-01T15:54:12.862544Z",
                    "number": "18",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "18"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:release/13.5-release|<p11",
                                "product": {
                                    "name": "vers:release/13.5-release|<p11",
                                    "product_id": "CSAFPID-5915633"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:release/14.3-release|<p10",
                                "product": {
                                    "name": "vers:release/14.3-release|<p10",
                                    "product_id": "CSAFPID-5915132"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:release/14.4-release|<p1",
                                "product": {
                                    "name": "vers:release/14.4-release|<p1",
                                    "product_id": "CSAFPID-5915131"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:release/15.0-release|<p5",
                                "product": {
                                    "name": "vers:release/15.0-release|<p5",
                                    "product_id": "CSAFPID-5915126"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "FreeBSD"
                    }
                ],
                "category": "vendor",
                "name": "FreeBSD"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/stable <13.5",
                                "product": {
                                    "name": "vers:unknown/stable <13.5",
                                    "product_id": "CSAFPID-5917554"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/stable <14.4",
                                "product": {
                                    "name": "vers:unknown/stable <14.4",
                                    "product_id": "CSAFPID-5917553"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/stable <15.0",
                                "product": {
                                    "name": "vers:unknown/stable <15.0",
                                    "product_id": "CSAFPID-5917552"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "FreeBSD OS"
                    }
                ],
                "category": "vendor",
                "name": "FreeBSD Project"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-4747",
            "cwe": {
                "id": "CWE-121",
                "name": "Stack-based Buffer Overflow"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet.  This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow.  Notably, this does not require the client to authenticate itself first.\n\nAs kgssapi.ko's RPCSEC_GSS implementation is vulnerable, remote code execution in the kernel is possible by an authenticated user that is able to send packets to the kernel's NFS server while kgssapi.ko is loaded into the kernel.\n\nIn userspace, applications which have librpcgss_sec loaded and run an RPC server are vulnerable to remote code execution from any client able to send it packets.  We are not aware of any such applications in the FreeBSD base system.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4747"
                },
                {
                    "category": "description",
                    "text": "Each RPCSEC_GSS data packet is validated by a routine which checks a signature in the packet.  This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow.  Notably, this does not require the client to authenticate itself first.\n\nAs kgssapi.ko's RPCSEC_GSS implementation is vulnerable, remote code execution in the kernel is possible by an authenticated user that is able to send packets to the kernel's NFS server while kgssapi.ko is loaded into the kernel.\n\nIn userspace, applications which have librpcgss_sec loaded and run an RPC server are vulnerable to remote code execution from any client able to send it packets.  We are not aware of any such applications in the FreeBSD base system.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4747.json"
                },
                {
                    "category": "other",
                    "text": "0.00164",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.5",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "Is related to (a version of) an uncommon product, Exploit code publicly available, Is related to a product by vendor Freebsd, The value of the most recent EPSS score, There is exploit data available from source Cveprojectv5",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5915126",
                    "CSAFPID-5915131",
                    "CSAFPID-5915132",
                    "CSAFPID-5915633",
                    "CSAFPID-5917552",
                    "CSAFPID-5917553",
                    "CSAFPID-5917554"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4747"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4747.json"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0878.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0878.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0878"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-26:06.tcp.asc"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-26:07.nvmf.asc"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-26:08.rpcsec_gss.asc"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-26:09.pf.asc"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://github.com/califio/publications/tree/main/MADBugs/CVE-2026-4747"
                },
                {
                    "category": "external",
                    "summary": "Reference - nvd",
                    "url": "https://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/exploit.py"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "products": [
                        "CSAFPID-5915126",
                        "CSAFPID-5915131",
                        "CSAFPID-5915132",
                        "CSAFPID-5915633",
                        "CSAFPID-5917552",
                        "CSAFPID-5917553",
                        "CSAFPID-5917554"
                    ]
                }
            ],
            "title": "CVE-2026-4747"
        }
    ]
}