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Description

Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.71.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin. The problem has been fixed in Microsoft.SemanticKernel.Core version 1.71.0. As a mitigation, 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.

PUBLISHED Reserved 2026-02-03 | Published 2026-02-06 | Updated 2026-02-18 | Assigner GitHub_M




CRITICAL: 10.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

< 1.71.0
affected

References

github.com/...kernel/security/advisories/GHSA-2ww3-72rp-wpp4

github.com/microsoft/semantic-kernel/pull/13478/changes

github.com/...samples/Demos/CodeInterpreterPlugin/Program.cs

cve.org (CVE-2026-25592)

nvd.nist.gov (CVE-2026-25592)

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