Advisory [CVE-2026-111821] Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB
This security Apache Software Foundation advisory covers CVE-2026-111821 affecting Apache ActiveMQ.
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Summary
Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB.
A user can create a durable subscription with a clientId and subscription name that have a combined length > 65,535 (while separately being shorter) on a broker using KahaDB which can cause the broker to shutdown and be unrecoverable.
This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: 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 · medium-confidence parse· fetched 16 hours ago·verify at source
- 6.3.3
- 6.4.0
- 5.19.12
Official advisory · medium-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 · medium-confidence parse· fetched 16 hours ago·verify at source
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