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.
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Fixes

Solution

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Workaround

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History

Wed, 04 Nov 2026 10:45:00 +0000

Type Values Removed Values Added
References

Wed, 04 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache ActiveMQ, Apache ActiveMQ KahaDB: Oversized client identifier strings poison the KahaDB journal
Weaknesses CWE-20
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-11-04T10:10:41.422Z

Reserved: 2026-10-16T22:59:40.999Z

Link: CVE-2026-111821

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-04T10:17:25.363

Modified: 2026-11-04T10:17:25.363

Link: CVE-2026-111821

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses