Description
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 – < 10.0.11 | 10.0.11 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – < 8.0.30 | 8.0.30 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – < 9.0.19 | 9.0.19 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.38 | 17.14.38 |
| Microsoft | Microsoft Visual Studio 2026 version 18.8 | 18.0 – < 18.8.3 | 18.8.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | dotnet7 | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dotnet10-runtime | 10.0.12-r0 | — |
| Alpine v3.24 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.24 | dotnet9-runtime | 9.0.20-r0 | — |
| Alpine v3.23 | dotnet10-runtime | 10.0.13-r0 | — |
| Alpine v3.23 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.23 | dotnet9-runtime | 9.0.20-r0 | — |
| Alpine v3.22 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.22 | dotnet9-runtime | 9.0.20-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| NuGet | Microsoft.NETCore.App.Runtime.win-arm64 | >= 10.0.0, < 10.0.11 | 10.0.11 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-arm64 | >= 9.0.0, < 9.0.19 | 9.0.19 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-arm64 | >= 8.0.0, < 8.0.30 | 8.0.30 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x64 | >= 10.0.0, < 10.0.11 | 10.0.11 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x64 | >= 9.0.0, < 9.0.19 | 9.0.19 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x64 | >= 8.0.0, < 8.0.30 | 8.0.30 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x86 | >= 10.0.0, < 10.0.11 | 10.0.11 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x86 | >= 9.0.0, < 9.0.19 | 9.0.19 | GHSA-c494-m2fq-59mx |
| NuGet | Microsoft.NETCore.App.Runtime.win-x86 | >= 8.0.0, < 8.0.30 | 8.0.30 | GHSA-c494-m2fq-59mx |
Advisories 2
- WID-SEC-2026-2761 Microsoft Developer Tools: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- MSRC-CVE-2026-62898 Microsoft QUIC Information Disclosure Vulnerability Microsoft Security Response Center · Aug 13, 2026
References
- Microsoft QUIC Information Disclosure Vulnerability vendor-advisory patch