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CRITICAL

CVE-2026-26030

CVSS v3

9.9

CRITICAL

EPSS Score

3.7 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

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.

Technical details

Published
2026-02-19
Last Modified
2026-03-03

Frequently asked questions

What is 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.

Is CVE-2026-26030 actively exploited?

Active exploitation of CVE-2026-26030 has not been confirmed. Its EPSS score was 3.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-26030?

CVE-2026-26030 has a CVSS v3 base score of 9.9 (CRITICAL severity).

Is CVE-2026-26030 affecting your environment?

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