Vulnerability in Apache Software Foundation Apache Tomcat Native

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund23 Sep 2026WID-SEC-2026-3559

  Apache Tomcat APR/native Connector: Multiple vulnerabilities Translated from German

  CVE-2026-86247CVE-2026-86246CVE-2026-86243

[ References ]References

• lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1Vendor Advisory
• www.openwall.com/lists/oss-security/2026/09/23/33Mailing ListThird Party Advisory