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.

CVSS v3.1

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

CVSS v3.1

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

EPSS

3.71% chance of exploitation in the next 30 days, 89th percentile

Published

2026-02-19

Updated

2026-02-26

Proof-of-concept exploits (1)

• mbanyamer/CVE-2026-26030-Microsoft-Semantic-Kernel-1.39.4-RCE1★ · 2026-02-24

References

• CVE Record
• NVD entry

Related

• CVE-2019-7711
• CVE-2021-41579
• CVE-2023-31059
• CVE-2025-24076
• CVE-2025-24813
• CVE-2025-30397