Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apache ActiveMQ, Apache ActiveMQ All and Apache ActiveMQ MQTT versions 6.0.0 before 6.2.4 are affected by an integer overflow or wraparound flaw in how the MQTT control packet remaining length field is validated. The source does not describe what an attacker needs or what they can do after exploiting it. Upgrade to version 6.2.4, or to a 5.19.x release starting with 5.19.2.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.4 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.0038, the 32nd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV