CVE-2026-53404: Apache Tomcat

High severity, CVSS 7.3. EPSS: 0.7% chance of exploitation in the next 30 days.

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the first condition in an OR chain matched, subsequent non-OR conditions were skipped. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

Affected products

• Apache Tomcat: from 8.5.0, up to and including 8.5.100; from 9.0.0, before 9.0.119 (fixed in 9.0.119); from 10.1.0, before 10.1.56 (fixed in 10.1.56); from 11.0.0, before 11.0.23 (fixed in 11.0.23)

Published 2026-06-29. Last modified 2026-07-02.