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CVE-2026-26030

CRITICAL CVSS 3.1: 9.9 EPSS 0.09%
Updated Feb 20, 2026
Microsoft
Parameter Value
CVSS 9.9 (CRITICAL)
Affected Versions before 1.39.4
Type CWE-94 (Code Injection)
Vendor Microsoft
Public PoC No

Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the `InMemoryVectorStore` filter functionality. The problem has been fixed in version `python-1.39.4`. Users should upgrade this version or higher.

As a workaround, avoid using `InMemoryVectorStore` for production scenarios.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)