CVE-2026-25592
February 06, 2026
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.
Affected Packages
https://github.com/microsoft/semantic-kernel.git (GITHUB):
Affected version(s) >=python-0.2.4.dev <python-1.39.3Fix Suggestion:
Update to version python-1.39.3https://github.com/microsoft/semantic-kernel.git (GITHUB):
Affected version(s) >=dotnet-0.13.277.1-preview <python-1.70.0Fix Suggestion:
Update to version python-1.70.0microsoft.semantickernel.core (NUGET):
Affected version(s) >=0.12.207.1-preview <1.71.0Fix Suggestion:
Update to version 1.71.0semantic-kernel (PYTHON):
Affected version(s) >=0.0.1.dev0 <1.39.3Fix Suggestion:
Update to version 1.39.3Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
EPSS
Base Score:
0.04
