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GHSA-2ww3-72rp-wpp4

Semantic Kernel has Arbitrary File Write via AI Agent Function Calling in .NET SDK

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-25592

Packages

EcosystemPackageAffectedFixed in
PyPI semantic-kernel < 1.39.3 1.39.3
NuGet Microsoft.SemanticKernel.Core < 1.71.0 1.71.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact _What kind of vulnerability is it? Who is impacted?_ An Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the `SessionsPythonPlugin`. Developers who have built applications which include Microsoft's Semantic Kernel .NET SDK and are using the `SessionsPythonPlugin` ### Patches _Has the problem been patched? What versions should users upgrade to?_ The problem has been fixed in [Microsoft.SemanticKernel.Plugins.Core version 1.71.0](https://www.nuget.org/packages/Microsoft.SemanticKernel.Plugins.Core/1.71.0). Users should upgrade to version 1.71.0 or higher. ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ Users can create a [Function Invocation Filter](https://learn.microsoft.com/en-us/semantic-kernel/concepts/enterprise-readiness/filters?pivots=programming-language-csharp#function-invocation-filter) which checks the arguments being passed to any calls to `DownloadFileAsync ` or `UploadFileAsync` and ensures the provided `localFilePath` is allow listed. ### References _Are there any links users can visit to find out more?_ - [Sample showing safe use of the CodeInterpreterPlugin](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64) - [PR to Add file upload security controls to SessionsPythonPlugin](https://github.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943d)

References

External links from the advisory. They lead to third-party sites.