high8.1
CVE-2026-70197
Microsoft Security Advisory CVE-2026-70197 - .NET and Visual Studio Remote Code Execution Vulnerability
Impact
Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.NETCore.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| nuget | Microsoft.NETCore.App.Runtime.win-x64 | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| nuget | Microsoft.NETCore.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.31 | 8.0.32 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | .NET 9.0 Installed On Linux | from 9.0.0 before 9.0.320 |
| Microsoft | .NET 8.0 Installed On Linux | from 8.0.0 before 8.0.427 |
| Microsoft | .NET 9.0 Installed On Windows | from 9.0.0 before 9.0.320 |
| Microsoft | .NET 8.0 Installed On Windows | from 8.0.0 before 8.0.427 |
| Microsoft | .NET 10.0 Installed On Windows | from 10.0.0 before 10.0.403 |
| Microsoft | .NET 9.0 Installed On Mac OS | from 9.0.0 before 9.0.320 |
| Microsoft | .NET 8.0 Runtime | from 8.0.0 before 8.0.32 |
| Microsoft | .NET 10.0 Installed On Mac OS | from 10.0.0 before 10.0.403 |
| Microsoft | .NET 11.0 Installed On Linux | from 11.0.0-preview.1 before 11.0.100-rc.3 |
| Microsoft | .NET 11.0 Runtime | from 11.0.0 before 11.0.0-rc.2 |
| Microsoft | Microsoft Visual Studio 2026 Version 18.11 | from 18.11.0 before 18.11.2 |
| Microsoft | Microsoft Visual Studio 2026 Version 18.10 | from 18.10.0 before 18.10.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4mpw-cpwj-hxxj
- https://github.com/dotnet/runtime/security/advisories/GHSA-4mpw-cpwj-hxxj
- https://github.com/dotnet/announcements/issues/466
- https://github.com/dotnet/runtime/issues/135702
- https://nvd.nist.gov/vuln/detail/CVE-2026-70197
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70197