CVE-2019-5432: Mqtt-Packet Project Mqtt-Packet

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.

Affected products

• Mqtt-Packet Project Mqtt-Packet: before 3.5.1 (fixed in 3.5.1); from 4.0.0, up to and including 4.1.3; from 5.0.0, up to and including 5.6.1; from 6.0.0, up to and including 6.1.2

Published 2019-05-06. Last modified 2026-06-17.