CVE-2026-34487: Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token

[Mark Thomas <markt () apache org>]

Severity: low

Affected versions:

- Apache Tomcat 11.0.0-M1 through 11.0.20
- Apache Tomcat 10.1.0-M1 through 10.1.53
- Apache Tomcat 9.0.13 through 9.0.116

Description:

Insertion of Sensitive Information into Log File vulnerability in the 
cloud membership for clustering component of Apache Tomcat exposed the 
Kubernetes bearer token.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 
10.1.0-M1 through 10.1.53, from 9.0.13 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, 
which fix the issue.

Credit:

Bartlomiej Dmitruk, striga.ai (finder)

References:

https://lists.apache.org/thread/4xpkwolpkrj8v5xzp5nyovtlqp3y850h
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-34487