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CVE-2026-111821

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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 Improper Input Validation
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Versions

From the CNA's record in the CVE List.

ProductAffected
Apache Software Foundation Apache ActiveMQfrom 6.0.0 before 6.3.3
Apache Software Foundation Apache ActiveMQbefore 5.19.12
Apache Software Foundation Apache ActiveMQ KahaDBfrom 6.0.0 before 6.3.3
Apache Software Foundation Apache ActiveMQ KahaDBbefore 5.19.12

Attack patterns (CAPEC)

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-20 (51).

References

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