CVE-2026-57227 Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 7.0.0 until 7.0.17 and 8.0.6, the MQTT parser in rust/src/mqtt/mqtt.rs permits repeated PUBREC or PUBREL messages to be appended to one transaction without a limit. Crafted...

CVE-2026-57227

Suricata (a network IDS/IPS/NNSM engine) has a denial-of-service vulnerability in its MQTT parser (rust/src/mqtt/mqtt.rs). The root cause is that repeated PUBREC or PUBREL messages can be appended to a single transaction without any limit, allowing crafted MQTT traffic to grow transaction state i...