CVE-2026-43515: Apache Tomcat: Security constraints not correctly applied

[Mark Thomas <markt () apache org>]

Severity: moderate

Affected versions:

- Apache Tomcat 11.0.0-M1 through 11.0.21
- Apache Tomcat 10.1.0-M1 through 10.1.54
- Apache Tomcat 9.0.0.M1 through 9.0.117
- Apache Tomcat 8.5.0 through 8.5.100
- Apache Tomcat 7.0.0 through 7.0.109
- Apache Tomcat before 7.00 unknown

Description:

Improper Authorization vulnerability when multiple method constraints 
define an HTTP method for the same extension in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 
10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 
through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 
which fix the issue.

References:

https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkgmwpc6bb
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-43515