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CVE-2026-114550— libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability

Quick assessment

Affected
libwebsockets libwebsockets
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libwebsockets MQTT 协议 PUBACK 数据包处理中的越界写入远程代码执行漏洞。该漏洞允许远程攻击者在受影响的 libwebsockets 安装上执行任意代码，利用此漏洞无需进行身份验证。 具体缺陷存在于 PUBACK 数据包的处理逻辑中。问题源于对用户提供的数据缺乏适当的验证，导致攻击者能够向已分配缓冲区的末尾之外写入数据。攻击者可利用该漏洞，在当前进程的上下文中执行恶意代码。此漏洞对应 ZDI-CAN-31039。

AI Predicted 9.8 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114550

Vulnerability Information
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Vulnerability Title
libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of PUBACK packets. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31039.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libwebsockets libwebsockets b4b5aed3903eaff09cd76a410f69bbe5dff66f8e -

II. Public POCs for CVE-2026-114550

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III. Intelligence Information for CVE-2026-114550

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Other References for CVE-2026-114550 (2)

IV. Related Vulnerabilities

Same product: libwebsockets
Same vendor: libwebsockets
Same weakness: CWE-787