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VULNERABILITIES

CVE-2026-105794 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412 [email protected]
https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91 [email protected]
https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81 [email protected]
https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83 [email protected]
https://github.com/microsoft/msquic/pull/6274 [email protected]

see all 12 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-295Improper Certificate Validation[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-105794
NVD Published Date:
Oct 6, 2026
NVD Last Modified:
Oct 6, 2026
Source:
[email protected]
CVE-2026-105794 Details - Not Deferred