Out-of-bounds Read in Liambindle Mqtt-C
CVE-2026-54412
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (35.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.004 · change: -0.003
Affected products
- Liambindle Mqtt-C — versions 0
Weakness classification (CWE)
References
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (technical-description)
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (technical-description)
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (product)
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (product)
Frequently asked questions
- What is CVE-2026-54412?
- CVE-2026-54412 is a high-severity vulnerability in Liambindle Mqtt-C, classified under Out-of-bounds Read. CVSS score: 8.2/10. Published 2026-06-14.
- How severe is CVE-2026-54412?
- High severity. CVSS v3 base score is 8.2 out of 10.