CVE-2026-26030

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.

Affected products

Inmemoryvectorstore, Semantic-Kernel

Microsoft Semantic Kernel

< 1.39.4

Fix

Available

CVSS 3.1

9.9 CRITICAL

EPSS

3.7% (89th percentile)

Weakness

CWE-94

NVD status

Analyzed

Published

2026-02-19