CVE-2026-70197 · GHSA-4mpw-cpwj-hxxj
Microsoft Security Advisory CVE-2026-70197 - .NET and Visual Studio Remote Code Execution Vulnerability
- Risk score
- 79/100
- CVSS
- 8.1 v3.1
- Exploit chance (30 days)
- 0.7%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- A .NET out-of-bounds write vulnerability allows an attacker to execute code remotely. An attacker could execute code over a network.
- Affected
- {'products': ['Microsoft .NET', 'Visual Studio'], 'packages': [{'ecosystem': 'nuget', 'name': 'Microsoft.NETCore.App.Runtime.win-arm64', 'vulnerable': '>= 8.0.0, <= 8.0.31', 'patched': '8.0.32'}, {'ecosystem': 'nuget', 'name': 'Microsoft.NETCore.App.Runtime.win-x64', 'vulnerable': '>= 8.0.0, <= 8.0.31', 'patched': '8.…
- Fix
- Upgrade to patched versions: 8.0.32, 11.0.0-rc.2, 9.0.21
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.1 high
- Remotely exploitable without logging in
- On your watchlist: .net, NuGet
- Named in a government or vendor bulletin
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| Microsoft.NETCore.App.Runtime.win-arm64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.NETCore.App.Runtime.win-x64 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.NETCore.App.Runtime.win-x86 | nuget | >= 8.0.0, <= 8.0.31 | 8.0.32 |
| Microsoft.NETCore.App.Runtime.win-arm64 | nuget | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| Microsoft.NETCore.App.Runtime.win-x64 | nuget | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| Microsoft.NETCore.App.Runtime.win-x86 | nuget | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| Microsoft.NETCore.App.Runtime.win-arm64 | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
| Microsoft.NETCore.App.Runtime.win-x64 | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
| Microsoft.NETCore.App.Runtime.win-x86 | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
| Microsoft.NETCore.App.Runtime.win-arm64 | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
| Microsoft.NETCore.App.Runtime.win-x64 | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
| Microsoft.NETCore.App.Runtime.win-x86 | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
Government and vendor bulletins
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70197
- 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://github.com/advisories/GHSA-4mpw-cpwj-hxxj
Original description
Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.
Last activity 19 Oct 2026. Patch Forecast updates every hour.