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CVE-2026-54412— MQTT-C Heap Out-of-Bounds Read and Integer Underflow in mqtt_unpack_publish_response()

Quick assessment

Affected
LiamBindle MQTT-C
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Liam Bindle MQTT-C是加拿大Liam Bindle个人开发者的一个用C语言编写的MQTT客户端。 LiamBindle MQTT-C 1.1.6及之前版本存在安全漏洞，该漏洞源于src/mqtt.c中的mqtt_unpack_publish_response()函数存在堆越界读取和整数下溢，可能允许远程未经验证的攻击者通过发送特制的PUBLISH数据包导致订阅的MQTT-C客户端崩溃并可能泄露相邻堆内存。

CVSS 8.2 · High EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
LiamBindle MQTT-C ≤ 1.1.6 affected
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I. Basic Information for CVE-2026-54412

Vulnerability Information
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Vulnerability Title
MQTT-C Heap Out-of-Bounds Read and Integer Underflow in mqtt_unpack_publish_response()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Liam Bindle MQTT-C 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Liam Bindle MQTT-C是加拿大Liam Bindle个人开发者的一个用C语言编写的MQTT客户端。 LiamBindle MQTT-C 1.1.6及之前版本存在安全漏洞，该漏洞源于src/mqtt.c中的mqtt_unpack_publish_response()函数存在堆越界读取和整数下溢，可能允许远程未经验证的攻击者通过发送特制的PUBLISH数据包导致订阅的MQTT-C客户端崩溃并可能泄露相邻堆内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LiamBindle MQTT-C 0 ~ 1.1.6 -

II. Public POCs for CVE-2026-54412

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10577 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-54412

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News Coverage for CVE-2026-54412 (1)

Vendor Pages for CVE-2026-54412 (1)

Other References for CVE-2026-54412 (1)

IV. Related Vulnerabilities

Same weakness: CWE-125

V. Comments for CVE-2026-54412

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