CVE-2026-29129 Apache Tomcat: TLS cipher order is not preserved

What is CVE-2026-29129?

CVE-2026-29129 is a high-severity vulnerability in Apache Tomcat, published on 9 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Configured cipher preference order not preserved vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.16 through 11.0.18, from 10.1.51 through 10.1.52, from 9.0.114 through 9.0.115.

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

Weakness: CWE-327

Which versions are affected by CVE-2026-29129?

19 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat. It affects 1 product.

Products include Apache Tomcat.

How do I fix CVE-2026-29129?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.1.53, 11.0.20 or 9.0.116.

Is CVE-2026-29129 being exploited?

There is no known exploitation of CVE-2026-29129 in the wild and no public exploit code.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-tomcat-2026-29129, DEBIAN-CVE-2026-29129, GHSA-69cc-cv78-qc8g, MINI-7p6r-v2x3-9vf2, MINI-hw5v-388h-pg2x, MINI-wv3g-57qq-jj42 and 2 more.