CVE-2026-70354 .NET Core Remote Code Execution Vulnerability
An out-of-bounds write in .NET allows local attackers to execute arbitrary code, requiring patches for affected runtimes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-70354?
CVE-2026-70354 is a high-severity memory corruption vulnerability in Microsoft .Net, published on 11 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
Weakness: CWE-787
Which versions are affected by CVE-2026-70354?
20 open source packages ship an affected version, including Microsoft.WindowsDesktop.App.Runtime.win-arm64, dotnet and dotnet-sdk. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 9.0.0 | 9.0.19 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 9.0.0 | 9.0.19 |
14 more packages
dotnet Bitnami | From 8.0.0 | 8.0.30, 9.0.19, 10.0.11 |
dotnet-sdk Bitnami | From 8.0.0 | 8.0.30, 9.0.19, 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 9.0.0 | 9.0.19 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 9.0.0 | 9.0.19 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 10.0.0 | 10.0.11 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 8.0.0 | 8.0.30 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 9.0.0 | 9.0.19 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 9.0.0 | 9.0.19 |
Products include Microsoft .Net, Microsoft .Net Framework, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026.
How do I fix CVE-2026-70354?
Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a fixed version for your release line: 10.0.11, 8.0.30 or 9.0.19.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-70354 being exploited?
There is no known exploitation of CVE-2026-70354 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net
- CVE-2024-43498 .NET and Visual Studio Remote Code Execution Vulnerability
- CVE-2024-0057 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as BELL-CVE-2026-70354, BIT-dotnet-2026-70354, BIT-dotnet-sdk-2026-70354, GHSA-gg8c-3338-xw2f, MINI-q55q-jgqw-gcf4, MINI-vpc2-hq3r-7g29 and 1 more.