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

Weaknesses (CWE)

CWE-94

Threats tracking this CVE

• Microsoft Semantic Kernel — Critical RCE & Arbitrary File Write Chain (CVE-2026-26030, CVE-2026-25592) — CRITICAL
• Microsoft Semantic Kernel Prompt-Injection-to-RCE & Arbitrary File Write — CVE-2026-26030 (InMemoryVectorStore eval) + CVE-2026-25592 (SessionsPythonPlugin) — CRITICAL

References

• https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx
• https://github.com/microsoft/semantic-kernel/pull/13505
• https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4

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