CVE-2026-34487: Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 11.0.21 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 10.1.54 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 9.0.117
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34487?
CVE-2026-34487 is considered a critical vulnerability due to the exposure of sensitive Kubernetes bearer tokens.
How do I fix CVE-2026-34487?
To fix CVE-2026-34487, upgrade Apache Tomcat to a version above 11.0.20, 10.1.53, or 9.0.116 as applicable.
Which versions of Apache Tomcat are affected by CVE-2026-34487?
CVE-2026-34487 affects Apache Tomcat from version 9.0.13 to 9.0.116, 10.1.0-M1 to 10.1.53, and 11.0.0-M1 to 11.0.20.
What impact does CVE-2026-34487 have on my system?
CVE-2026-34487 can lead to unauthorized access to sensitive information and potentially compromise your Kubernetes environment.
Is there a workaround for CVE-2026-34487 if I cannot upgrade immediately?
While upgrading is the recommended solution, temporarily isolating affected components and restricting access can mitigate the risk until an upgrade can be performed.