CVE-2026-34500: Apache Tomcat: OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled

[Mark Thomas <markt () apache org>]

Severity: moderate

Affected versions:

- Apache Tomcat 11.0.0-M14 through 11.0.20
- Apache Tomcat 10.1.22 through 10.1.53
- Apache Tomcat 9.0.92 through 9.0.116

Description:

CLIENT_CERT authentication does not fail as expected for some scenarios 
when soft fail is disabled and FFM is used in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 
10.1.22 through 10.1.53, from 9.0.92 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, 
which fixes the issue.

Credit:

Haruki Oyama (Waseda University) (finder)

References:

https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-34500