Bug 2456950 (CVE-2026-40046) - CVE-2026-40046 org.apache.activemq/apache-activemq: org.apache.activemq/activemq-all: org.apache.activemq/activemq-mqtt: MQTT control packet remaining length field is not properly validated (missing fix for CVE-2025-66168)
Summary: CVE-2026-40046 org.apache.activemq/apache-activemq: org.apache.activemq/activ...
Keywords:
Status: NEW
Alias: CVE-2026-40046
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-09 17:02 UTC by OSIDB Bzimport
Modified: 2026-04-10 17:01 UTC (History)
23 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-09 17:02:11 UTC 
Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT.

The fix for "CVE-2025-66168: MQTT control packet remaining length field is not properly validated" was only applied to 5.19.2 (and future 5.19.x) releases but was missed for all 6.0.0+ versions.


This issue affects Apache ActiveMQ: from 6.0.0 before 6.2.4; Apache ActiveMQ All: from 6.0.0 before 6.2.4; Apache ActiveMQ MQTT: from 6.0.0 before 6.2.4.



Users are recommended to upgrade to version 6.2.4 or a 5.19.x version starting with 5.19.2 or later (currently latest is 5.19.5), which fixes the issue.
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