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High, CVSS 7.5

Remote Denial of Service Vulnerability in Microsoft QUIC

GHSA-2x7m-gf85-3745

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (microsoft.native.quic.msquic.schannel 2.3.5, 2.2.7, 2.1.12; microsoft.native.quic.msquic.openssl 2.3.5, 2.2.7, 2.1.12), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-2x7m-gf85-3745 lists affected ranges: NuGet microsoft.native.quic.msquic.openssl >=0 =2.2.0 =2.3.0 =2.2.0 =2.3.0 =0 <2.1.12

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact The MsQuic server will continue to leak memory until no more is available, resulting in a denial of service. Patches The following patch was made: - Fix Memory Leak from Multiple Decodes of TP - https://github.com/microsoft/msquic/commit/5d070d661c45979946615289e92bb6b822efe9e9 Workarounds Beyond upgrading to the patched versions, there is no other workaround. MSRC CVE Info https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26190

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-2x7m-gf85-3745

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-2x7m-gf85-3745

Advisory: Remote Denial of Service Vulnerability in Microsoft QUIC
IDs: GHSA-2x7m-gf85-3745
Record: https://patchnext.com/advisories/ghsa-2x7m-gf85-3745 (revision 1, source checked 26 Oct 2026, 17:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.native.quic.msquic.schannel 2.3.5, 2.2.7, 2.1.12; microsoft.native.quic.msquic.openssl 2.3.5, 2.2.7, 2.1.12. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.native.quic.msquic.schannel: affected >= 2.2.0, < 2.2.7; >= 2.3.0, < 2.3.5; < 2.1.12; fixed in 2.1.12, 2.2.7, 2.3.5
- NuGet microsoft.native.quic.msquic.openssl: affected < 2.1.12; >= 2.2.0, < 2.2.7; >= 2.3.0, < 2.3.5; fixed in 2.1.12, 2.2.7, 2.3.5

## Suggested inspection (read-only)
- NuGet microsoft.native.quic.msquic.schannel: check the installed version with your package manager.
- NuGet microsoft.native.quic.msquic.openssl: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.native.quic.msquic.schannel, microsoft.native.quic.msquic.openssl.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2x7m-gf85-3745 (GitHub-reviewed advisory GHSA-2x7m-gf85-3745 lists affected ranges: NuGet microsoft.native.quic.msquic.openssl >=0 =2.2.0 =2.3.0 =2.2.0 =2.3.0 =0 <2.1.12)

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