Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution

CRITICO 9.9CVE-2026-26030 · GHSA-xjw9-4gw8-4rqx · PYSEC-2026-163 · Published 19/02/2026 · updated 17/06/2026

In breve

CVE-2026-26030 è una vulnerabilità CRITICO (CVSS 9.9) che riguarda semantic-kernel, semantic kernel (microsoft).
Probabilità di sfruttamento nei prossimi 30 giorni (EPSS): 3.9%, superiore al 90.3% delle vulnerabilità.
Correzione: aggiornare a 1.39.4 o successiva.

Package	Affected versions	Patched versions
semantic-kernel PyPI	`< 1.39.4`	`1.39.4`
semantic kernel microsoft	`< 1.39.4`	`1.39.4`

Description

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. Users should upgrade this version or higher.

Workarounds:

Avoid using InMemoryVectorStore for production scenarios.

References:

Release python-1.39.4 · microsoft/semantic-kernel · GitHub PR to block use of dangerous attribute names that must not be accessed in filter expressions

NVD 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.

References

microsoft/semantic-kernel security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-26030 · ADVISORY
microsoft/semantic-kernel#13505 · WEB
microsoft/semantic-kernel · PACKAGE
microsoft/semantic-kernel release python-1.39.4 · WEB
pypa/advisory-database · WEB

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Package

Affected versions

Patched versions

semantic-kernel

PyPI

< 1.39.4

1.39.4

semantic kernel

microsoft

< 1.39.4

1.39.4

Description

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. Users should upgrade this version or higher.

Workarounds:

Avoid using InMemoryVectorStore for production scenarios.

References:

Release python-1.39.4 · microsoft/semantic-kernel · GitHub PR to block use of dangerous attribute names that must not be accessed in filter expressions

NVD description