CVE-2026-54412 [HIGH] – LiamBindle MQTT-C through version 1.1.6 contains a heap-based out-of-bounds read and integ

LiamBindle MQTT-C through version 1.1.6 contains a heap-based out-of-bounds read and integer underflow in the mqtt_unpack_publish_response function in src/mqtt.c that allows a remote unauthenticated attacker controlling an MQTT broker – or able to inject MQTT traffic into an unencrypted session – to crash a subscribed MQTT-C client and potentially disclose adjacent heap memory by sending a single crafted PUBLISH packet.