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CVE-2026-25592

CVE-2026-25592 · Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 10.0 · Critical · EPSS 2.5% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • semantic-kernel

    Versions
    • < 1.71.0: Affected

    No fix published

  • semantic-kernel PyPI

    Versions
    • 0.0.1.dev0
    • 0.1.0.dev0
    • 0.2.0.dev0
    • 0.2.1.dev0
    • 0.2.2.dev0
    • 0.2.3.dev0
    • 0.2.4.dev0
    • 0.2.5.dev0
    • 0.2.6.dev0
    • 0.2.7.dev0
    • 0.2.8.dev0
    • 0.2.9.dev0
    • 0.3.0.dev0
    • 0.3.1.dev0
    • 0.3.10.dev0
    • 0.3.11.dev0
    • 0.3.12.dev0
    • 0.3.13.dev0
    • 0.3.14.dev0
    • 0.3.15.dev0
    • 0.3.2.dev0
    • 0.3.3.dev0
    • 0.3.4.dev0
    • 0.3.5.dev0
    • 0.3.6.dev0
    • 0.3.7.dev0
    • 0.3.8.dev0
    • 0.3.9.dev0
    • 0.4.0.dev0
    • 0.4.1.dev0
    • 0.4.2.dev0
    • 0.4.3.dev0
    • 0.4.4.dev0
    • 0.4.5.dev0
    • 0.4.6.dev0
    • 0.4.7.dev0
    • 0.5.0.dev0
    • 0.5.1.dev0
    • 0.9.0b1
    • 0.9.1b1
    • 0.9.2b1
    • 0.9.3b1
    • 0.9.4b1
    • 0.9.5b1
    • 0.9.6b1
    • 0.9.7b1
    • 0.9.8b1
    • 0.9.9b1
    • 1.0.0
    • 1.0.0rc1
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.1.0
    • 1.1.1
    • 1.1.2
    • 1.10.0
    • 1.10.1
    • 1.11.0
    • 1.12.0
    • 1.12.1
    • 1.13.0
    • 1.14.0
    • 1.15.0
    • 1.16.0
    • 1.17.0
    • 1.17.1
    • 1.18.0
    • 1.18.1
    • 1.18.2
    • 1.19.0
    • 1.2.0
    • 1.20.0
    • 1.21.0
    • 1.21.1
    • 1.21.2
    • 1.21.3
    • 1.22.0
    • 1.22.1
    • 1.23.0
    • 1.23.1
    • 1.24.0
    • 1.24.1
    • 1.25.0
    • 1.26.0
    • 1.26.1
    • 1.27.0
    • 1.27.1
    • 1.27.2
    • 1.28.0
    • 1.28.1
    • 1.29.0
    • 1.3.0
    • 1.30.0
    • 1.31.0
    • 1.32.0
    • 1.32.1
    • 1.32.2
    • 1.33.0
    • 1.34.0
    • 1.35.0
    • 1.35.1
    • 1.35.2
    • 1.35.3
    • 1.36.0
    • 1.36.1
    • 1.36.2
    • 1.37.0
    • 1.37.1
    • 1.38.0
    • 1.39.0
    • 1.39.1
    • 1.39.2
    • 1.4.0
    • 1.5.0
    • 1.5.1
    • 1.6.0
    • 1.7.0
    • 1.8.0
    • 1.8.1
    • 1.8.2
    • 1.8.3
    • 1.9.0
    Affected ranges
    • ECOSYSTEM: < 1.39.3

    Update to 1.39.3

  • microsoft.semantickernel.core NuGet

    Versions
    • 0.12.207.1-preview
    • 0.13.277.1-preview
    • 0.13.442.1-preview
    • 0.14.547.1-preview
    • 0.15.230531.5-preview
    • 0.15.230609.2-preview
    • 0.15.231219.1-preview
    • 0.16.230615.1-preview
    • 0.17.230626.1-preview
    • 1.0.0-beta1
    • 1.0.0-beta2
    • 1.0.0-beta3
    • 1.0.0-beta4
    • 1.0.0-beta5
    • 1.0.0-beta6
    • 1.0.0-beta7
    • 1.0.0-beta8
    • 1.0.0-rc1
    • 1.0.0-rc2
    • 1.0.0-rc3
    • 1.0.0-rc4
    • 1.0.1
    • 1.1.0
    • 1.10.0
    • 1.11.0
    • 1.11.1
    • 1.12.0
    • 1.13.0
    • 1.14.0
    • 1.14.1
    • 1.15.0
    • 1.15.1
    • 1.16.0
    • 1.16.1
    • 1.16.2
    • 1.17.0
    • 1.17.1
    • 1.17.2
    • 1.18.0-rc
    • 1.18.1-rc
    • 1.18.2
    • 1.19.0
    • 1.2.0
    • 1.20.0
    • 1.21.0
    • 1.21.1
    • 1.22.0
    • 1.23.0
    • 1.24.0
    • 1.24.1
    • 1.25.0
    • 1.26.0
    • 1.27.0
    • 1.28.0
    • 1.29.0
    • 1.3.0
    • 1.3.1
    • 1.30.0
    • 1.31.0
    • 1.32.0
    • 1.33.0
    • 1.34.0
    • 1.35.0
    • 1.36.0
    • 1.36.1
    • 1.37.0
    • 1.38.0
    • 1.39.0
    • 1.4.0
    • 1.40.0
    • 1.40.1
    • 1.41.0
    • 1.42.0
    • 1.43.0
    • 1.44.0
    • 1.45.0
    • 1.46.0
    • 1.47.0
    • 1.48.0
    • 1.49.0
    • 1.5.0
    • 1.50.0
    • 1.51.0
    • 1.52.0
    • 1.52.1
    • 1.53.0
    • 1.53.1
    • 1.54.0
    • 1.55.0
    • 1.56.0
    • 1.57.0
    • 1.58.0
    • 1.59.0
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.60.0
    • 1.61.0
    • 1.62.0
    • 1.63.0
    • 1.64.0
    • 1.65.0
    • 1.66.0
    • 1.67.0
    • 1.67.1
    • 1.68.0
    • 1.69.0
    • 1.7.0
    • 1.7.1
    • 1.70.0
    • 1.8.0
    • 1.9.0
    Affected ranges
    • ECOSYSTEM: < 1.71.0

    Update to 1.71.0

Original sources

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