CVE-2026-26030

CRITICAL 10.0

Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-94
Vendor	microsoft
Product	semantic-kernel
Ecosystems	Windows .NET Azure
Industries	TechnologyEnterprise
Published	Feb 19, 2026
Last Updated	Feb 26, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

microsoft / semantic-kernel

< 1.39.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx github.com: https://github.com/microsoft/semantic-kernel/pull/13505 github.com: https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4