Unrated severityNVD Advisory· Published Nov 4, 2026
CVE-2026-111821
CVE-2026-111821
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.
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Affected products
2- Range: from 6.0.0 before 6.3.3, before 5.19.12
Patches
Vulnerability mechanics
References
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