CVE-2026-25592: Semantic Kernel has Arbitrary File Write via AI Agent Function Calling in .NET SDK
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…
Published Feb 6, 2026 · Updated Feb 20, 2026
Affected packages
semantic-kernel
- Ecosystem
- PyPI
- Affected
- < 1.39.3
- Fixed in
- 1.39.3
- Check
pip show semantic-kernel
Microsoft.SemanticKernel.Core
- Ecosystem
- NuGet
- Affected
- < 1.71.0
- Fixed in
- 1.71.0
- Check
dotnet list package --include-transitive
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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. 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 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?_
Credited to doredry, amiteliahu, urioren.
References
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-2ww3-72rp-wpp4
- https://github.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943d
- https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64
- https://nvd.nist.gov/vuln/detail/CVE-2026-25592
- https://github.com/advisories/GHSA-2ww3-72rp-wpp4
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology