MinorCritical vulnerability

CVE-2026-86247 (CVSS 7.4)

NVD · officialPublished Sep 23, 2026Risk 23/100EPSS 0.2%

Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.

Technical details

CVSS

7.4

AV:NetworkAC:HighPR:NoneUI:NoneC:HighI:HighA:None

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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