CVE-2026-54412CWE-125CWE-191

CVE-2026-54412

High · published June 14, 2026

CVSS v3.1
8.2
EPSS
1%
Percentile
53.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00717 · 53.3th percentile
Weaknesses
CWE-125 · Out-of-bounds Read; CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-06-14T22:17Z
References (4)
https://cwe.mitre.org/data/definitions/125.html · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2chttps://cwe.mitre.org/data/definitions/191.html · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2chttps://github.com/LiamBindle/MQTT-C · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2chttps://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334 · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
EPSS history
Timeline
  • 14 JUN 17:26Z
    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…
    cvelistv5