CVE-2026-26030
Critical
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.
SeverityCritical
CVSS9.9
Exploit probability—
Product
Microsoft Semantic Kernel
PublishedFeb 19, 2026
First seenFeb 19, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- microsoft semantic_kernel1.39.4 or later
- semantic-kernel1.39.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft semantic_kernel | v < 1.39.4 | 1.39.4 |
| semantic-kernelPyPI | v < 1.39.4 | 1.39.4 |
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