CVE-2026-105794

Severity not reported

Data quality: awaiting analysis. NVD has not completed analysis, so CVSS and affected-product data may be missing or change.

MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust.

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.

CVSS

—

Awaiting analysis by NVD

Timeline (UTC)

Published: 2026-10-06 15:17

Modified: 2026-10-06 18:16

NVD status: Awaiting Analysis

Last synced 2 days ago

Verified against the source API 2026-10-27 06:57 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-295

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

References

https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412 security-advisories@github.com
https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91 security-advisories@github.com
https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81 security-advisories@github.com
https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83 security-advisories@github.com
https://github.com/microsoft/msquic/pull/6274 security-advisories@github.com
https://github.com/microsoft/msquic/pull/6275 security-advisories@github.com
https://github.com/microsoft/msquic/pull/6276 security-advisories@github.com
https://github.com/microsoft/msquic/pull/6277 security-advisories@github.com
https://github.com/microsoft/msquic/releases/tag/v2.4.20 security-advisories@github.com
https://github.com/microsoft/msquic/releases/tag/v2.5.11 security-advisories@github.com
https://github.com/microsoft/msquic/releases/tag/v2.6.1 security-advisories@github.com
https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7 security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:57 UTC · record ↗

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