CVE-2018-12543: Eclipse Mosquitto

High severity, CVSS 7.5. EPSS: 36% chance of exploitation in the next 30 days.

In Eclipse Mosquitto versions 1.5 to 1.5.2 inclusive, if a message is published to Mosquitto that has a topic starting with $, but that is not $SYS, e.g. $test/test, then an assert is triggered that should otherwise not be reachable and Mosquitto will exit.

Affected products

• Eclipse Mosquitto: from 1.5.0, up to and including 1.5.2

Published 2018-11-15. Last modified 2026-06-17.