CVE-2026-57227

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.

• https://github.com/OISF/suricata/commit/03ba8a71d827dd36a0ceb512f45d2f440f260a3aPatch
• https://github.com/OISF/suricata/commit/5cde93dea38533c9b225128ba9d54955997dc273Patch
• https://github.com/OISF/suricata/commit/c03666d261256df5a2d1f5800872da8a5addf6a5Patch
• https://github.com/OISF/suricata/releases/tag/suricata-7.0.17Release Notes
• https://github.com/OISF/suricata/releases/tag/suricata-8.0.6Release Notes
• https://github.com/OISF/suricata/security/advisories/GHSA-7h2h-hpj2-9w6pMitigation
• https://redmine.openinfosecfoundation.org/issues/8525Permissions Required