{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-105794",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-05T20:37:19.364Z",
        "datePublished": "2026-10-06T14:14:54.483Z",
        "dateUpdated": "2026-10-06T17:40:05.706Z"
    },
    "containers": {
        "cna": {
            "title": "MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-295",
                            "lang": "en",
                            "description": "CWE-295: Improper Certificate Validation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 9.1,
                        "baseSeverity": "CRITICAL",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7"
                },
                {
                    "name": "https://github.com/microsoft/msquic/pull/6274",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/pull/6274"
                },
                {
                    "name": "https://github.com/microsoft/msquic/pull/6275",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/pull/6275"
                },
                {
                    "name": "https://github.com/microsoft/msquic/pull/6276",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/pull/6276"
                },
                {
                    "name": "https://github.com/microsoft/msquic/pull/6277",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/pull/6277"
                },
                {
                    "name": "https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412"
                },
                {
                    "name": "https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91"
                },
                {
                    "name": "https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81"
                },
                {
                    "name": "https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83"
                },
                {
                    "name": "https://github.com/microsoft/msquic/releases/tag/v2.4.20",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/releases/tag/v2.4.20"
                },
                {
                    "name": "https://github.com/microsoft/msquic/releases/tag/v2.5.11",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/releases/tag/v2.5.11"
                },
                {
                    "name": "https://github.com/microsoft/msquic/releases/tag/v2.6.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/microsoft/msquic/releases/tag/v2.6.1"
                }
            ],
            "affected": [
                {
                    "vendor": "microsoft",
                    "product": "msquic",
                    "versions": [
                        {
                            "version": "< 2.4.20",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.5.0, < 2.5.11",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.6.0, < 2.6.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-06T14:14:54.483Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1."
                }
            ],
            "source": {
                "advisory": "GHSA-w5f4-fx9m-m4q7",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-06T17:34:05.356189Z",
                                "id": "CVE-2026-105794",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-06T17:40:05.706Z"
                }
            }
        ]
    }
}