CVE-2026-34486: Apache Tomcat Tribes Unauthenticated RCE

Дата публикации: 25-08-2026 08:01:22

Apache Tomcat is an open-source Java application server that provides a robust platform for hosting Java web applications and enterprise services. The Tomcat Tribes module enables clustering functionality, allowing multiple Tomcat instances to communicate for session replication and high availability.
A recently disclosed vulnerability in the Tomcat Tribes clustering component allow an unauthenticated remote attacker to achieve remote code execution (RCE) by sending specially crafted cluster messages to an exposed Tribes receiver. The vulnerability is caused by a fail-open regression introduced during the fix for CVE-2026-29146, which allows malicious messages to bypass encryption validation and reach the deserialization stage. This vulnerability has been assigned CVE-2026-34486. This article analyzes CVE-2026-34486, the vulnerable code path, affected versions, and detection considerations.

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