CVE-2026-26030CWE-94

Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution

Critical · published February 19, 2026

CVSS v3.1
10.0
EPSS
4%
Percentile
90.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
10.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.04134 · 90.8th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-02-19T16:00Z
EPSS history
Timeline
  • 19 FEB 16:00Z
    Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
    cvelistv5