Description
Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 installed on Linux | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 10.0 installed on Mac OS | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 10.0 installed on Windows | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 10.0 runtime | 10.0.0 – < 10.0.13 | 10.0.13 |
| Microsoft | .NET 11.0 installed on Linux | 11.0.0-preview.1 – < 11.0.100-rc.3 | 11.0.100-rc.3 |
| Microsoft | .NET 11.0 installed on Mac OS | 11.0.0-preview.1 – < 11.0.100-rc.3 | 11.0.100-rc.3 |
| Microsoft | .NET 11.0 installed on Windows | 11.0.0-preview.1 – < 11.0.100-rc.3.26522.148 | 11.0.100-rc.3.26522.148 |
| Microsoft | .NET 11.0 runtime | 11.0.0 – < 11.0.0-rc.2 | 11.0.0-rc.2 |
| Microsoft | .NET 8.0 installed on Linux | 8.0.0 – < 8.0.427 | 8.0.427 |
| Microsoft | .NET 8.0 installed on Mac OS | 8.0.0 – < 8.0.427 | 8.0.427 |
| Microsoft | .NET 8.0 installed on Windows | 8.0.0 – < 8.0.427 | 8.0.427 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – < 8.0.32 | 8.0.32 |
| Microsoft | .NET 9.0 installed on Linux | 9.0.0 – < 9.0.320 | 9.0.320 |
| Microsoft | .NET 9.0 installed on Mac OS | 9.0.0 – < 9.0.320 | 9.0.320 |
| Microsoft | .NET 9.0 installed on Windows | 9.0.0 – < 9.0.320 | 9.0.320 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – < 9.0.21 | 9.0.21 |
| Microsoft | Microsoft Visual Studio 2019 version 16.11 | 16.11.0 – < 16.11.61 | 16.11.61 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.43 | 17.14.43 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 – < 18.10.4 | 18.10.4 |
| Microsoft | Microsoft Visual Studio 2026 version 18.11 | 18.11.0 – < 18.11.2 | 18.11.2 |
| Microsoft | Microsoft Visual Studio 2026 version 18.12 | 18.12.0 – < 18.12 Insiders 3 | 18.12 Insiders 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | dotnet-hostfxr-8.0 +7 | 8.0.32-0.1.hum1 | RHSA-2026:84693 |
| Red Hat Hardened Images 1 | dotnet8.0 +4 | 8.0.132-0.1.hum1 | RHSA-2026:84693 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dotnet10-runtime | 10.0.13-r0 | — |
| Alpine v3.24 | dotnet8-runtime | 8.0.32-r0 | — |
| Alpine v3.24 | dotnet9-runtime | 9.0.21-r0 | — |
| Alpine v3.23 | dotnet10-runtime | 10.0.13-r0 | — |
| Alpine v3.23 | dotnet8-runtime | 8.0.32-r0 | — |
| Alpine v3.23 | dotnet9-runtime | 9.0.21-r0 | — |
| Alpine v3.22 | dotnet8-runtime | 8.0.32-r0 | — |
| Alpine v3.22 | dotnet9-runtime | 9.0.21-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dotnet +5 | 8.0.133-1.amzn2023.0.1 | ALAS2023-2026-3374, ALAS2023-2026-3367, ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-host +8 | 8.0.33-1.amzn2023.0.1 | ALAS2023-2026-3374, ALAS2023-2026-3367, ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-hostfxr-10.0 +7 | 10.0.14-1.amzn2023.0.1 | ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-hostfxr-9.0 +7 | 9.0.22-1.amzn2023.0.1 | ALAS2023-2026-3374 |
| Amazon Linux 2023 | dotnet-sdk-10.0 +4 | 10.0.114-1.amzn2023.0.1 | ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-sdk-9.0 +4 | 9.0.123-1.amzn2023.0.1 | ALAS2023-2026-3374 |
Affected packages
Advisories 7
- WID-SEC-2026-3893 Microsoft Entwicklerwerkzeuge: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- ALAS2023-2026-3366 Important: dotnet10.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ALAS2023-2026-3367 Important: dotnet8.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ALAS2023-2026-3374 Important: dotnet9.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- MSRC-CVE-2026-70197 .NET and Visual Studio Remote Code Execution Vulnerability Microsoft Security Response Center · Oct 25, 2026
- RHSA-2026:84693 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- NCSC-2026-0426 Kwetsbaarheden verholpen in Microsoft Developer Tools NCSC-NL (Netherlands) · Oct 13, 2026
References
- .NET and Visual Studio Remote Code Execution Vulnerability vendor-advisory patch