Bug 2566614 (CVE-2026-114550) - CVE-2026-114550 libwebsockets: libwebsockets: arbitrary code execution via crafted MQTT PUBACK packets
Summary: CVE-2026-114550 libwebsockets: libwebsockets: arbitrary code execution via cr...
Keywords:
Status: NEW
Alias: CVE-2026-114550
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-04 00:01 UTC by OSIDB Bzimport
Modified: 2026-11-04 00:14 UTC (History)
10 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-04 00:01:32 UTC 
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.
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