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Vulnerability record · CVE-2026-54412 · published 14 June 2026

CVE-2026-54412: Out-of-bounds read vulnerability

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.

7.8 CVSS 4.0 High EPSS 0.72% · top 48.1% CWE-125 · Out-of-bounds readCWE-191 · CWE-191 Deferred
7.8CVSS 4.0 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
10 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-54412), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.