CVE-2026-111821

HighCVSS 7.5/10Last modified Nov 10, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Apache Software Foundation	Apache ActiveMQ	>= 6.0.0, < 6.3.3; < 5.19.12
Apache Software Foundation	Apache ActiveMQ KahaDB	>= 6.0.0, < 6.3.3; < 5.19.12

References

Timeline

Published: Nov 4, 2026
Last modified: Nov 10, 2026
NVD status: Awaiting Analysis

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