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Posted to announce@tomcat.apache.org by Mark Thomas <ma...@apache.org> on 2026/05/12 15:06:57 UTC

[SECURITY] CVE-2026-43515 Apache Tomcat - Security constraints not correctly applied

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

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.21
Apache Tomcat 10.1.0-M1 to 10.1.54
Apache Tomcat 9.0.0.M1 to 9.0.117
Older, unsupported versions may also be affected

Description:
When multiple security constraints defined an HTTP method constraint for 
the same extension pattern, only the first method constraint was applied.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.22 or later
- Upgrade to Apache Tomcat 10.1.55 or later
- Upgrade to Apache Tomcat 9.0.118 or later

History:
2026-05-12 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