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Vulnerability record · CVE-2026-86247 · published 23 September 2026

CVE-2026-86247: Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification r…

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.

7.4 CVSS 3.1 High EPSS 0.18% · top 93.3% CWE-366 · CWE-366 Awaiting Analysis
7.4CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1
http://www.openwall.com/lists/oss-security/2026/09/23/33

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Source: NIST National Vulnerability Database (record CVE-2026-86247), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.