CVE-2026-54412

Summary

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.

Affected Software

Weaknesses

• CWE-125: CWE-125 Out-of-bounds Read
• CWE-191: CWE-191 Integer Underflow (Wrap or Wraparound)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/LiamBindle/MQTT-C
• https://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334
• https://cwe.mitre.org/data/definitions/125.html
• https://cwe.mitre.org/data/definitions/191.html

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