{"cve":"CVE-2026-40046","nvd":{"published":"2026-04-09T17:16:31.650","modified":"2026-10-26T00:10:00.150","status":"Awaiting Analysis","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-190"],"references":["https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt","https://lists.apache.org/thread/zdntj5rcgjjzrpow84o339lzldy68zrg","https://www.cve.org/CVERecord?id=CVE-2025-66168"],"products":[],"source":"nvd","synced_at":"2026-10-26T00:31:35.753532240+00:00"},"epss":{"cve":"CVE-2026-40046","score":0.00375,"percentile":0.31165,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-xvqc-pp94-fmpx","url":"https://osv.dev/vulnerability/GHSA-xvqc-pp94-fmpx","summary":"Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT vulnerable to Integer Overflow or Wraparound","modified":"2026-04-13T08:27:19.495842350Z","packages":[{"ecosystem":"Maven","name":"org.apache.activemq:apache-activemq","purl":"pkg:maven/org.apache.activemq/apache-activemq","ranges":[">=6.0.0 <6.2.4"],"fixed":["6.2.4"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-all","purl":"pkg:maven/org.apache.activemq/activemq-all","ranges":[">=6.0.0 <6.2.4"],"fixed":["6.2.4"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-mqtt","purl":"pkg:maven/org.apache.activemq/activemq-mqtt","ranges":[">=6.0.0 <6.2.4"],"fixed":["6.2.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}