{"id":"EUVD-2026-93422","revision":"c66347a4e98148f88fbc7b83124bc791","records":[{"revision":"c66347a4e98148f88fbc7b83124bc791","observedAt":"2026-11-01T02:07:02.903+00:00","statement":{"source":"euvd","id":"EUVD-2026-93422","aliases":["CVE-2026-105794","GHSA-w5f4-fx9m-m4q7"],"title":"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 certific…","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. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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":9.1,"severity":null}],"references":["https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7","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/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://euvd.enisa.europa.eu/vulnerability/EUVD-2026-93422","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 6, 2026, 2:14:54 PM","dateUpdated":"Oct 6, 2026, 5:40:05 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-93422","identifiers":["EUVD-2026-93422","CVE-2026-105794","GHSA-w5f4-fx9m-m4q7"]},"retained":false,"historicalAffected":[]}],"coverage":[]}