vulnerability · Tue 06 Oct 2026 · 15:33 UTC
GHSA-w5f4-fx9m-m4q7: MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL
Filed UTCSource GTH ↗
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.
Signals
as the pipeline stamped them- High
- Critical vulnerability
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-105794 | — | 1% | NVD ↗ |
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