CVE-2026-57227: Oisf Suricata

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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 MQTT traffic can grow transaction state indefinitely, consuming CPU and memory and causing slowdown or denial of service. This issue is fixed in versions 8.0.6 and 7.0.17.

Affected products

• Oisf Suricata: from 7.0.0, before 7.0.17 (fixed in 7.0.17); from 8.0.0, before 8.0.6 (fixed in 8.0.6)

Published 2026-09-18. Last modified 2026-09-29.