Severity: moderate Affected versions:
- Apache Artemis (org.apache.artemis:artemis-selector) 2.50.0 through 2.56.0 - Apache ActiveMQ Artemis (org.apache.activemq:artemis-selector) 1.0.0 through 2.44.0 Description: An authenticated client could attach a consumer with a selector containing crafted wildcard usage that results in excessive evaluation during message delivery attempts, occupying a shared broker thread and leading to denial of service. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes this issue. Credit: Mike Read (finder) References: https://artemis.apache.org https://www.cve.org/CVERecord?id=CVE-2026-75880
