Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT: Missing fix for CVE-2025-66168: MQTT control packet remaining length field is not properly validated

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Summary

CVECVE-2026-40046
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 17:16:31 UTC
Updated2026-04-09 17:16:31 UTC
DescriptionInteger 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.

Risk And Classification

Problem Types: CWE-190 | CWE-190 CWE-190 Integer Overflow or Wraparound

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache ActiveMQ affected 6.0.0 6.2.4 semver Not specified
CNA Apache Software Foundation Apache ActiveMQ All affected 6.0.0 6.2.4 semver Not specified
CNA Apache Software Foundation Apache ActiveMQ MQTT affected 6.0.0 6.2.4 semver Not specified

References

ReferenceSourceLinkTags
activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt [email protected] activemq.apache.org
lists.apache.org/thread/zdntj5rcgjjzrpow84o339lzldy68zrg [email protected] lists.apache.org
www.cve.org/CVERecord [email protected] www.cve.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Adrien Bernard (en)

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