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CVE

CVE-2026-105794

MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL
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CVE

CVE-2026-105794

MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL

Summary

Improper TLS hostname verification allows a man-in-the-middle (MITM) attack on MsQuic. 

Details

Only MsQuic with the OpenSSL and QuicTLS TLS backends is affected (the Schannel backend is not affected).

Patches

2.6.1, 2.5.11, and 2.4.20

Impact

An on-path attacker could spoof a server identity by using a certificate that doesn't match the intended target server hostname.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
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
C
H
U
0
-
C
H
U
9.1
-
4.0
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

Related Resources

No items found.

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

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.01001%
EPSS Percentile
0.62883%
Introduced Version
0,1.8.0,2.5.3,2.6.0-rc
Fix Available
2.4.20,2.5.11,2.6.1

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