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Vulnerabilities

Vulnerability · 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 filter functionality.

Published Feb 19, 2026 · catalog updated Feb 26, 2026 · Microsoft

Last checked Nov 12, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-26030. EPSS is 3.91%. Act only if a listed version of Microsoft is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical10.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.91%
Remediation
Version ranges on file
Affected products
vendor Microsoft semantic-kernel < 1.39.4

Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the filter functionality. The problem has been fixed in version . Users should upgrade this version or higher. As a workaround, avoid using for production scenarios.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft semantic-kernel < 1.39.4< 1.39.4

How to fix CVE-2026-26030

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-26030. EPSS is 3.91%. Act only if a listed version of Microsoft is installed.

Which versions are affected?

Compare what you have installed with Microsoft semantic-kernel < 1.39.4 < 1.39.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 3.91%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 19, 2026 · EUVD

    Detected

    Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the filter functionality. The problem has been fixed in version . Users should upgrade this version or higher. As a workaround, avoid using for production scenarios.

  2. Feb 26, 2026 · EUVD

    Updated

    Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the filter functionality. The problem has been fixed in version . Users should upgrade this version or higher. As a workaround, avoid using for production scenarios.

Sources

  • CVE.orgVulnerability recordCVE-2026-26030

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-26030

    30-day exploitation probability 3.91%

    first.org
  • EUVDVulnerability recordEUVD-2026-8014

    Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the filter functionality. The problem has been fixed in version . Users should upgrade this version or higher. As a workaround, avoi

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 12, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 9, 2026
  • CVE.orgNov 9, 2026
  • EUVDNov 9, 2026