{"id":"CVE-2026-40046","published":"2026-04-09T15:58:32Z","modified":"2026-04-10T19:41:00Z","title":"Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT: Missing fix for CVE-2025-66168: MQTT control packet…","vendor":"Apache","product":"Apache ActiveMQ","tier":"tail","description":{"text":"Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT.\n\nThe 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.\n\n\nThis 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.\n\n\n\nUsers 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.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00375,"percentile":0.31339,"provenance":"source"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"references":[{"url":"https://www.cve.org/CVERecord?id=CVE-2025-66168","tags":["related"]},{"url":"https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt","tags":["vendor-advisory"]},{"url":"https://lists.apache.org/thread/zdntj5rcgjjzrpow84o339lzldy68zrg","tags":["vendor-advisory"]}],"priority":{"score":11.5,"factors":[{"name":"EPSS percentile","points":6.27},{"name":"CVSS severity","points":5.25}]},"vendorSlug":"apache","affectedVersions":[{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ","versions":[">= 6.0.0, < 6.2.4"]},{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ All","versions":[">= 6.0.0, < 6.2.4"]},{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ MQTT","versions":[">= 6.0.0, < 6.2.4"]}],"affected":[{"ecosystem":"Maven","package":"org.apache.activemq:apache-activemq","vulnerableRanges":[">=6.0.0, <6.2.4"],"patched":["6.2.4"],"from":["GHSA-xvqc-pp94-fmpx"],"provenance":"source"},{"ecosystem":"Maven","package":"org.apache.activemq:activemq-all","vulnerableRanges":[">=6.0.0, <6.2.4"],"patched":["6.2.4"],"from":["GHSA-xvqc-pp94-fmpx"],"provenance":"source"},{"ecosystem":"Maven","package":"org.apache.activemq:activemq-mqtt","vulnerableRanges":[">=6.0.0, <6.2.4"],"patched":["6.2.4"],"from":["GHSA-xvqc-pp94-fmpx"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-20956","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-apache-activemq-cve-2025-66168","parents":[{"from":"CVE-2025-66168","to":"CVE-2026-40046","relation":"successor","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-c825-6ph3-4h84","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-40046"},{"kind":"osv-related","provenance":"source","id":"GHSA-xvqc-pp94-fmpx","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2025-66168"},{"kind":"version-step","provenance":"source","package":"Maven:org.apache.activemq:apache-activemq","fromFixed":"6.2.1","toFixed":"6.2.4","daysApart":36},{"kind":"version-step","provenance":"source","package":"Maven:org.apache.activemq:activemq-mqtt","fromFixed":"6.2.1","toFixed":"6.2.4","daysApart":36},{"kind":"similar","provenance":"machine","score":0.36,"basis":"same product + CWE + description similarity"}]}],"packageHistory":[{"cve":"CVE-2026-33227","published":"2026-04-07","fixed":"6.2.2","kev":false},{"cve":"CVE-2026-34197","published":"2026-04-07","fixed":"6.2.3","kev":true,"link":{"from":"CVE-2026-34197","to":"CVE-2026-40046","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Maven:org.apache.activemq:activemq-all","fromFixed":"6.2.3","toFixed":"6.2.4","daysApart":2}]}},{"cve":"CVE-2026-39304","published":"2026-04-10","fixed":"6.2.4","kev":false},{"cve":"CVE-2026-40046","published":"2026-04-09","fixed":"6.2.4","kev":false},{"cve":"CVE-2026-40466","published":"2026-04-24","fixed":"6.2.5","kev":false},{"cve":"CVE-2026-41043","published":"2026-04-24","fixed":"6.2.5","kev":false},{"cve":"CVE-2026-41044","published":"2026-04-24","fixed":"6.2.5","kev":false}],"package":"Maven:org.apache.activemq:activemq-all"}}