CVE-2024-35512: Fhmq Hmq

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

hmq v1.5.5 is vulnerable to Denial of Service (DoS) due to a Null Pointer Exception. A remote attacker can trigger a broker crash by sending a specially crafted MQTT UNSUBSCRIBE packet with an illegal control character Topic. The failure to properly validate this field leads to a null pointer dereference, resulting in the immediate termination of the hmq process.

Affected products

• Fhmq Hmq: version 1.5.5 only

Published 2024-05-29. Last modified 2026-06-17.