CVE-2026-111821

Name of the Vulnerable Software and Affected Versions Apache ActiveMQ versions 6.0.0 through 6.3.2 Apache ActiveMQ versions prior to 5.19.12 Apache ActiveMQ KahaDB versions 6.0.0 through 6.3.2 Apache ActiveMQ KahaDB versions prior to 5.19.12

Description Improper input validation occurs when a user creates a durable subscription. If the combined length of the clientId and subscription name exceeds 65,535 characters, it can cause a broker using KahaDB to shut down and become unrecoverable.

Recommendations Upgrade Apache ActiveMQ to version 6.4.0, 6.3.3, or 5.19.12. Upgrade Apache ActiveMQ KahaDB to version 6.4.0, 6.3.3, or 5.19.12.