Microsoft QUIC: Remote Code Execution Vulnerability
Summary
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Details
New network path creations and removals triggered by incoming packets can lead to a pointer invalidation.
Patches
- Guard path promotion e0f55b5
Impact
An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.OpenSSL | >= 2.5.3, < 2.5.10, < 2.4.19 | 2.5.10, 2.4.19 |
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.Schannel | >= 2.5.3, < 2.5.10, < 2.4.19 | 2.5.10, 2.4.19 |
References
- 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
- 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
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-416- Platform
- .NET (NuGet)
- Package
Microsoft.Native.Quic.MsQuic.OpenSSL, Microsoft.Native.Quic.MsQuic.Schannel- Disclosed
- 08.09.2026
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-92f5-vc22-8j33 - CC BY 4.0
Vulnerability history: Microsoft.Native.Quic.MsQuic.OpenSSL
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 10.2023 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 3
Disclosures per year
- 2023: 2
- 2024: 1
- 2025: 0
- 2026: 3
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