CVE-2026-54412

Description

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.

References

https://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334

https://github.com/LiamBindle/MQTT-C

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-36663

https://cwe.mitre.org/data/definitions/191.html

https://cwe.mitre.org/data/definitions/125.html

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS