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CVE-2026-62815: Microsoft QUIC: Remote Code Execution Vulnerability

September 8, 2026

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

References

  • github.com/advisories/GHSA-92f5-vc22-8j33
  • github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0
  • github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20
  • github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b
  • github.com/microsoft/msquic/pull/6217
  • github.com/microsoft/msquic/pull/6219
  • github.com/microsoft/msquic/pull/6220
  • github.com/microsoft/msquic/releases/tag/v2.4.19
  • github.com/microsoft/msquic/releases/tag/v2.5.10
  • github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33
  • msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815
  • nvd.nist.gov/vuln/detail/CVE-2026-62815

Code Behaviors & Features

Detect and mitigate CVE-2026-62815 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions before 2.4.19, all versions starting from 2.5.3 before 2.5.10

Fixed versions

  • 2.4.19
  • 2.5.10

Solution

Upgrade to versions 2.4.19, 2.5.10 or above.

Impact 9.8 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Learn more about CVSS

Weakness

  • CWE-416: Use After Free

Source file

nuget/Microsoft.Native.Quic.MsQuic.OpenSSL/CVE-2026-62815.yml

Spotted a mistake? Edit the file on GitLab.

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