Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT vulnerable to Integer Overflow or Wraparound

GHSA-xvqc-pp94-fmpx · BIT-activemq-2026-40046 · CVE-2026-40046

Published Apr 9, 2026 · Modified Apr 13, 2026

Description

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.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-40046
WEB https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt
WEB https://lists.apache.org/thread/zdntj5rcgjjzrpow84o339lzldy68zrg
WEB https://www.cve.org/CVERecord?id=CVE-2025-66168

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