{"id":"EUVD-2026-93422","revision":null,"records":[{"revision":"705c766547964125977f652d9ceb4099","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105794","aliases":[],"title":"MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL","description":"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. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-105794","identifiers":["CVE-2026-105794"]},"retained":false,"historicalAffected":[]},{"revision":"b55001e5764a46d9962511e5b34f278d","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-w5f4-fx9m-m4q7","aliases":["CVE-2026-105794"],"title":"MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL","description":"# Summary\n\nImproper TLS hostname verification allows a man-in-the-middle (MITM) attack on MsQuic. \n\n# Details\n\nOnly MsQuic with the OpenSSL and QuicTLS TLS backends is affected (the Schannel backend is not affected).\n\n## Patches\n\n2.6.1, 2.5.11, and 2.4.20\n\n# Impact\n\nAn on-path attacker could spoof a server identity by using a certificate that doesn't match the intended target server hostname.","state":0,"publishedAt":"2026-10-06T15:33:08+00:00","modifiedAt":"2026-10-06T15:46:49.1953574+00:00","affected":[{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.4.20"}]}],"versions":["1.8.0"],"rawVersionEvidence":null},{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"2.5.0"},{"kind":"fixed","version":"2.5.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"2.6.0"},{"kind":"fixed","version":"2.6.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7","https://nvd.nist.gov/vuln/detail/CVE-2026-105794","https://github.com/microsoft/msquic/pull/6274","https://github.com/microsoft/msquic/pull/6275","https://github.com/microsoft/msquic/pull/6276","https://github.com/microsoft/msquic/pull/6277","https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412","https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91","https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81","https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83","https://github.com/microsoft/msquic","https://github.com/microsoft/msquic/releases/tag/v2.4.20","https://github.com/microsoft/msquic/releases/tag/v2.5.11","https://github.com/microsoft/msquic/releases/tag/v2.6.1"],"sourceUrl":"https://github.com/advisories/GHSA-w5f4-fx9m-m4q7","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w5f4-fx9m-m4q7","identifiers":["GHSA-w5f4-fx9m-m4q7","CVE-2026-105794"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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