[SECURITY] CVE-2026-29129 Apache Tomcat - Configured TLS cipher preference order not preserved

Mark Thomas <[email protected]> Thu, 9 Apr 2026 20:03:19 +0100

Newsgroups	gmane.comp.jakarta.tomcat.user,gmane.comp.apache.maven.announce,gmane.comp.apache.maven.announce,gmane.comp.apache.incubator.bigtop.devel
Message-ID	<[email protected]>

CVE-2026-29129 Apache Tomcat - Configured TLS cipher preference order 
not preserved

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 11.0.16 to 11.0.18
Apache Tomcat 10.1.51 to 10.1.52
Apache Tomcat 9.0.114 to 9.0.115

Description:
The additional of the ability to configure TLS 1.3 cipher suites did not 
preserve the order of the configured cipher suites and ciphers.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.20 or later
- Upgrade to Apache Tomcat 10.1.53 or later
- Upgrade to Apache Tomcat 9.0.116 or later

Credit:
This issue was identified by the Tomcat security team

History:
2026-04-09 Original advisory

References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html