Vulnerability record · CVE-2026-40046 · published 9 April 2026

CVE-2026-40046: Integer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.61% · top 52.9% CWE-190 · Integer overflow Undergoing Analysis

7.5CVSS 3.1 base score

0.61%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

3References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Link	Tags
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

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Source: NIST National Vulnerability Database (record CVE-2026-40046), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.