Medium [CVE-2026-108949] Denial of Service via OOM vulnerability in Apache ActiveMQ, ActiveMQ Broker
This medium-severity Apache Software Foundation advisory covers CVE-2026-108949 affecting Apache ActiveMQ.
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Summary
Denial of Service via OOM vulnerability in Apache ActiveMQ, ActiveMQ Broker.
An authenticated OpenWire client that sends a ConsumerInfo for a temporary queue/topic owned by another connection is rejected with InvalidDestinationException, but the rejected Subscription is left behind in the region's subscriptions map.
Repeating the request leaks broker heap until OOM because the broker does not clean up the rejected subscriptions in the map.
This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; ActiveMQ Broker: from 6.0.0 before 6.3.3, before 5.19.12.
Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.
- 6.0.0 before 6.3.3
Official advisory · high-confidence parse· fetched 16 hours ago·verify at source
- 6.3.3
- 6.4.0
- 5.19.12
Official advisory · high-confidence parse· fetched 16 hours ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.
Official advisory · high-confidence parse· fetched 16 hours ago·verify at source
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