Is there a public exploit for CVE-2026-111821?

No public exploit for CVE-2026-111821 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

What does CVE-2026-111821 affect?

CVE-2026-111821 affects Apache Software Foundation Apache ActiveMQ KahaDB, Apache ActiveMQ.

— Unscored

Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB.

CVE-2026-111821

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.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: Apache Software Foundation · Apache ActiveMQ · Apache ActiveMQ KahaDB
Assigner: apache

At the source

EUVD (ENISA)

References

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