Description
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 – < 10.0.13 | 10.0.13 |
| Microsoft | .NET 11.0 runtime | 11.0.0 – < 11.0.0-rc.2 | 11.0.0-rc.2 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – < 8.0.32 | 8.0.32 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – < 9.0.21 | 9.0.21 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.42 | 17.14.42 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 – < 18.10.4 | 18.10.4 |
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 | — |
Affected packages
Advisories 4
- WID-SEC-2026-3893 Microsoft Entwicklerwerkzeuge: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- RHSA-2026:84693 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- MSRC-CVE-2026-87697 .NET Remote Code Execution Vulnerability Microsoft Security Response Center · Oct 15, 2026
- NCSC-2026-0426 Kwetsbaarheden verholpen in Microsoft Developer Tools NCSC-NL (Netherlands) · Oct 13, 2026
References
- .NET Remote Code Execution Vulnerability vendor-advisory patch