Description
CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat, Apache Tomcat Native. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M7 through 10.1.52, from 9.0.83 through 9.0.115; Apache Tomcat Native: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39, from 1.3.0 through 1.3.6, from 2.0.0 through 2.0.13. Users are recommended to upgrade to version Tomcat Native 1.3.7 or 2.0.14 and Tomcat 11.0.20, 10.1.53 and 9.0.116, which fix the issue.
Problem types
CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled
Product status
11.0.0-M1 (semver)
10.1.0-M7 (semver)
9.0.83 (semver)
Any version
1.1.23 (semver)
1.2.0 (semver)
1.3.0 (semver)
2.0.0 (semver)
Credits
gregk4sec (https://github.com/gregk4sec)
References
www.openwall.com/lists/oss-security/2026/04/09/23
lists.apache.org/thread/yz5fxmhd2j43wgqykssdo7kltws57jfz