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Advisory record · GHSA-gvvw-8j96-8g5r

MsQuic has a Remote Elevation of Privilege Vulnerability

CVSS 9.8 CriticalCritical

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 16 Apr 2026, 01:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Microsoft.Native.Quic.MsQuic.OpenSSLNuGet>=2.5.0-ci.532574, <2.5.7 || <2.4.182.5.7, 2.4.18
Microsoft.Native.Quic.MsQuic.SchannelNuGet>=2.5.0-ci.532574, <2.5.7 || <2.4.182.5.7, 2.4.18
Identifiers
GHSA-gvvw-8j96-8g5r · CVE-2026-32179
Weakness (CWE)
CWE-191
Tags
Published
16 Apr 2026
Updated
8 May 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

MsQuic in the Microsoft.Native.Quic.MsQuic.OpenSSL and Microsoft.Native.Quic.MsQuic.Schannel NuGet packages is affected in versions before 2.4.18 and from 2.5.0-ci.532574 up to 2.5.7. An unauthorized attacker over the network may be able to exploit an integer underflow when parsing ACK frames to gain elevated privileges. Upgrade to version 2.4.18 or 2.5.7 to fix the issue.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 15:22 UTC First seen by agentprime
  2. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.