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CVE-2026-26030 — Vulnerability in semantic-kernel — CVE Details

CRITICAL

Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution

Published February 19, 2026Updated June 8, 2026Source: osv

Summary

### Impact: An RCE vulnerability has been identified in Microsoft Semantic Kernel Python SDK, specifically within the `InMemoryVectorStore` filter functionality. ### Patches: The problem has been fixed in [python-1.39.4](https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4). Users should upgrade this version or higher. ### Workarounds: Avoid using `InMemoryVectorStore` for production scenarios. ### References: [Release python-1.39.4 · microsoft/semantic-kernel · GitHub](https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4) [PR to block use of dangerous attribute names that must not be accessed in filter expressions](https://github.com/microsoft/semantic-kernel/pull/13505)

Advisory Timeline

  • First published February 19, 2026 (235 days ago).
  • Last revised June 8, 2026 — 109 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update semantic-kernel to 1.39.4 or later
pip install "semantic-kernel>=1.39.4"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
semantic-kernel
pypi
0.0.1.dev0, 0.1.0.dev0, 0.2.0.dev0, 0.2.1.dev0 (+122 more)1.39.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.9 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-26030?
Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.9/10).
How do I check if my project is affected by CVE-2026-26030?
CVE-2026-26030 affects semantic-kernel. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-26030 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.9

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-xjw9-4gw8-4rqx
PYSEC-2026-163

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