CVE-2026-35433 .NET Elevation of Privilege Vulnerability
High 7.3
Published
Updated
Check this codebase for CVE-2026-35433 and fix it if it is affected.
What it is: CVE-2026-35433 is a high-severity vulnerability in Microsoft .Net, published on 12 May 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.
Exploitation: There is no known exploitation of CVE-2026-35433 in the wild and no public exploit code.
Affected packages and fixed versions:
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 10.0.0; fixed in 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 10.0.0; fixed in 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.27
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.27
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 9.0.0; fixed in 9.0.16
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet): affected from 9.0.0; fixed in 9.0.16
- dotnet (Bitnami): affected from 8.0.0; fixed in 8.0.27, 9.0.16, 10.0.8
- dotnet-sdk (Bitnami): affected from 8.0.0; fixed in 8.0.27, 9.0.16, 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet): affected from 10.0.0; fixed in 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet): affected from 10.0.0; fixed in 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet): affected from 8.0.0; fixed in 8.0.27
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet): affected from 8.0.0; fixed in 8.0.27
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-35433/ (Markdown: https://insights.sbomify.com/CVE-2026-35433/index.md)
An attacker can locally elevate privileges due to improper input validation in the .NET runtime.
- 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-2026-35433?
CVE-2026-35433 is a high-severity vulnerability in Microsoft .Net, published on 12 May 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
Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-35433?
20 open source packages ship an affected version, including Microsoft.WindowsDesktop.App.Runtime.win-arm64, dotnet and dotnet-sdk. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 9.0.0 | 9.0.16 |
Microsoft.WindowsDesktop.App.Runtime.win-arm64 NuGet | From 9.0.0 | 9.0.16 |
14 more packages
dotnet Bitnami | From 8.0.0 | 8.0.27, 9.0.16, 10.0.8 |
dotnet-sdk Bitnami | From 8.0.0 | 8.0.27, 9.0.16, 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 9.0.0 | 9.0.16 |
Microsoft.WindowsDesktop.App.Runtime.win-x64 NuGet | From 9.0.0 | 9.0.16 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 10.0.0 | 10.0.8 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 8.0.0 | 8.0.27 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 9.0.0 | 9.0.16 |
Microsoft.WindowsDesktop.App.Runtime.win-x86 NuGet | From 9.0.0 | 9.0.16 |
Products include Microsoft .Net, Microsoft .Net Framework.
How do I fix CVE-2026-35433?
Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a fixed version for your release line: 10.0.8, 8.0.27 or 9.0.16.
Is CVE-2026-35433 being exploited?
There is no known exploitation of CVE-2026-35433 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-2026-35433, BIT-dotnet-2026-35433, BIT-dotnet-sdk-2026-35433, GHSA-8x9c-mqxv-q2pp, MINI-9mw6-3c7j-fwxq, MINI-xwwf-qv6p-h4rr and 1 more.