https://seclists.org/oss-sec/2026/q2/71: CVE-2026-40046: Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT: Missing fix for CVE-2025-66168: MQTT control packet maining length field is not properly validated

Published Apr 9, 2026
·
Updated

Affected Software

3 affected components
maven/org.apache.activemq/apache-activemq>=6.0.0<6.2.4
maven/org.apache.activemq/activemq-all>=6.0.0<6.2.4
maven/org.apache.activemq/activemq-mqtt>=6.0.0<6.2.4
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Frequently Asked Questions

1

What is the severity of CVE-2026-40046?

The severity of CVE-2026-40046 is moderate.

2

Which versions are affected by CVE-2026-40046?

CVE-2026-40046 affects Apache ActiveMQ versions before 6.2.4.

3

How do I fix CVE-2026-40046?

To fix CVE-2026-40046, update Apache ActiveMQ, Apache ActiveMQ All, or Apache ActiveMQ MQTT to version 6.2.4 or later.

4

What is the main issue addressed by CVE-2026-40046?

CVE-2026-40046 involves a missing fix for the improper validation of the MQTT control packet main length field.

5

Is there a known exploit for CVE-2026-40046?

As of now, there are no specific public exploit details available for CVE-2026-40046.

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