{"id":"CVE-2026-105794","revision":"c1af8c13fd964ab4b385a140738cbe2e","records":[{"revision":"c1af8c13fd964ab4b385a140738cbe2e","observedAt":"2026-10-25T04:17:29.458+00:00","statement":{"source":"nvd","id":"CVE-2026-105794","aliases":[],"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":"2026-10-06T15:17:16.26+00:00","modifiedAt":"2026-10-06T18:16:47.073+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9.1,"severity":"CRITICAL"}],"references":["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/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/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","https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-105794","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-295"],"productCriteria":[],"sourceDates":{"published":"2026-10-06T15:17:16.260","lastModified":"2026-10-06T18:16:47.073"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. 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":[]}],"coverage":[]}