CVE-2026-26030
CVE-2026-26030 is a critical-severity vulnerability in Microsoft Semantic Kernel with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.
Key facts
- Severity: Critical (CVSS 3.x base score 9.9)
- EPSS exploit prediction: 3% (85th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-8014
- Weakness: CWE-94
- Affected product: Microsoft Semantic Kernel
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-26030?
- CVE-2026-26030 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-26030 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-26030?
- CVE-2026-26030 affects Microsoft Semantic Kernel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-26030?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-26030 have an EU (EUVD) identifier?
- Yes. CVE-2026-26030 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8014.
- When was CVE-2026-26030 published?
- CVE-2026-26030 was published on 2026-02-19 and last updated on 2026-06-17.
References
- https://github.com/microsoft/semantic-kernel/pull/13505
- https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx
Affected products (1)
- cpe:2.3:a:microsoft:semantic_kernel:*:*:*:*:*:python:*:*
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