CVE-2026-111821
Apache ActiveMQ, Apache ActiveMQ KahaDB: Oversized client identifier strings poison the KahaDB journal
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-20 |
| Vendor | apache software foundation |
| Product | apache activemq |
| Published | Nov 4, 2026 |
| Last Updated | Nov 4, 2026 |
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Affected Versions
Apache Software Foundation / Apache ActiveMQ
6.0.0 < 6.3.3 0 < 5.19.12
Apache Software Foundation / Apache ActiveMQ KahaDB
6.0.0 < 6.3.3 0 < 5.19.12