critical9.8
CVE-2026-62815
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Impact
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.Native.Quic.MsQuic.OpenSSL | >= 2.5.3, < 2.5.10 | 2.5.10 |
| nuget | Microsoft.Native.Quic.MsQuic.Schannel | >= 2.5.3, < 2.5.10 | 2.5.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 11 23h2 | before 10.0.22631.7517 |
| Microsoft | Windows 11 24h2 | before 10.0.26100.9106 |
| Microsoft | Windows 11 25h2 | before 10.0.26200.9106 |
| Microsoft | Windows 11 26h1 | before 10.0.28000.2704 |
| Microsoft | Windows Server 2022 | before 10.0.20348.5440 |
| Microsoft | Windows Server 2025 | before 10.0.26100.33222 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-92f5-vc22-8j33
- https://github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33
- https://nvd.nist.gov/vuln/detail/CVE-2026-62815
- https://github.com/microsoft/msquic/pull/6217
- https://github.com/microsoft/msquic/pull/6219
- https://github.com/microsoft/msquic/pull/6220
- https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0
- https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20
- https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b
- https://github.com/microsoft/msquic/releases/tag/v2.4.19
- https://github.com/microsoft/msquic/releases/tag/v2.5.10
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815