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CVE-2026-26030

Microsoft Semantic Kernel remote code execution

9.9 CRITICALEPSS 3.70%
  1. Published19 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Microsoft Semantic Kernel< 1.39.4

Remediation

Fixed in
Microsoft Semantic Kernel≥ 1.39.4

References

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Frequently asked

Is CVE-2026-26030 being actively exploited?

CVE-2026-26030 is not in the CISA KEV catalog. Its EPSS exploit probability is 3.70%.

How severe is CVE-2026-26030?

CVE-2026-26030 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 3.70% probability of exploitation.

Which products are affected by CVE-2026-26030?

Affected products include Microsoft Semantic Kernel.

How do I fix CVE-2026-26030?

Upgrade affected software to a fixed version, for example Microsoft Semantic Kernel 1.39.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26030 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.