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OpenAdvisories
Critical · 9.8 CVE-2026-32179 GHSA-gvvw-8j96-8g5r

MsQuic has a Remote Elevation of Privilege Vulnerability

Published Apr 16, 2026 · Updated May 8, 2026 · Assigned by GHSA

Description

### Summary
Improper input validation in Microsoft QUIC allows an unauthorized attacker to elevate privileges over a network.

### Details
Improper Input Validation Integer Underflow (Wrap or Wraparound) when decoding ACK frame.

#### Patches
- Fix underflow in ACK frame parsing - 1e6e999b

### Impact
An attacker who successfully exploited this vulnerability could gain elevated privileges.

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet Microsoft.Native.Quic.MsQuic.OpenSSL >= 2.5.0-ci.532574, < 2.5.7 2.5.7 GHSA-gvvw-8j96-8g5r
NuGet Microsoft.Native.Quic.MsQuic.OpenSSL < 2.4.18 2.4.18 GHSA-gvvw-8j96-8g5r
NuGet Microsoft.Native.Quic.MsQuic.Schannel >= 2.5.0-ci.532574, < 2.5.7 2.5.7 GHSA-gvvw-8j96-8g5r
NuGet Microsoft.Native.Quic.MsQuic.Schannel < 2.4.18 2.4.18 GHSA-gvvw-8j96-8g5r

References