Description
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 – < 10.0.12 | 10.0.12 |
| Microsoft | .NET 11.0 runtime | 11.0.0 – < 11.0 RC1 | 11.0 RC1 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – < 8.0.31 | 8.0.31 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – < 9.0.20 | 9.0.20 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.40 | 17.14.40 |
| Microsoft | Microsoft Visual Studio 2026 version 18.9 | 18.9.0 – < 18.9.3 | 18.9.3 |
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.DiaSymReader.Native | >= 17.10.0-beta1.24272.1, < 18.9.0-beta1.26405.2 | 18.9.0-beta1.26405.2 | GHSA-527h-q9f6-p7qx |
Advisories 2
- WID-SEC-2026-3242 Microsoft Entwicklerwerkzeuge: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Oct 6, 2026
- MSRC-CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability Microsoft Security Response Center · Sep 25, 2026
References
- .NET and Visual Studio Elevation of Privilege Vulnerability vendor-advisory patch