Medium [CVE-2026-53404] Incorrect control flow in rewrite valve allows unexpected rule processing
This medium-severity Red Hat Linux advisory covers CVE-2026-53404 affecting Red Hat JBoss Web Server 6.2.4, Red Hat JBoss Web Server 6.2 on RHEL 10, Red Hat JBoss Web Server 6.2 on RHEL 8.
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Summary
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.
This can lead to unintended rule processing, potentially allowing for security bypasses or unauthorized access due to misapplied configurations. A flaw was found in Apache Tomcat's RewriteValve.
When rewrite rules use OR-chained conditions followed by non-OR conditions, the processing logic may not evaluate conditions correctly, potentially allowing unintended rule matches. Exploitation requires the RewriteValve to be enabled with specific OR-chained condition patterns, which is not a default configuration.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-358.
Affected products named by the advisory: Red Hat JBoss Web Server 6.2.4; Red Hat JBoss Web Server 6.2 on RHEL 10; Red Hat JBoss Web Server 6.2 on RHEL 8; Red Hat JBoss Web Server 6.2 on RHEL 9; and 13 more.
- 11.0.0
- 11.0.22
- 10.1.0
- 10.1.55
- 9.0.0
- 9.0.118
- 8.5.0
- 8.5.100
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- 11.0.23
- 10.1.56
- 9.0.119
- tomcat-catalina
- jws6-tomcat-0:10.1.49-15.redhat_00013.1.el10jws
- jws6-tomcat-0:10.1.49-15.redhat_00013.1.el8jws
- jws6-tomcat-0:10.1.49-15.redhat_00013.1.el9jws
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el10jws
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el8jws
- jws7-tomcat-0:11.0.21-6.redhat_00005.1.el9jws
- tomcat10-main-10.1.56-1.hum1
- tomcat11-main-11.0.23-0.1.hum1
- RHSA-2026:43402
- RHSA-2026:43401
- RHSA-2026:49951
- RHSA-2026:29203
- RHSA-2026:32960
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- This vulnerability only affects Tomcat deployments that use the RewriteValve with OR-chained rewrite conditions. Deployments that do not use the RewriteValve are not affected. Review rewrite rules for OR-chained conditions and test rule evaluation behavior.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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