CVE-2026-114550

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    CVE-2026-114550

    Published: 3 Nov 2026Last Modified: 8 Nov 2026

    Summary: libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114550.json, https://github.com/warmcat/libwebsockets/commit/c9e8e1834d7f13038c82963086b90e2ee9c5b44c, https://nvd.nist.gov/vuln/detail/CVE-2026-114550, https://www.zerodayinitiative.com/advisories/ZDI-26-792/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- b4b5aed3903eaff09cd76a410f69bbe5dff66f8e
    Fixed -c9e8e1834d7f13038c82963086b90e2ee9c5b44c

    Affected versions

    b4b5aed3903eaff09cd76a410f69bbe5dff66f8e

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-114550 | CVE-DB