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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| libwebsockets | libwebsockets | unknown |
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No data available yet.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Wed, 04 Nov 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | libwebsockets MQTT Protocol PUBACK Packet Handling Out-Of-Bounds Write Remote Code Execution Vulnerability | |
| Weaknesses | CWE-787 | |
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| Metrics |
cvssV3_0
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: zdi
Published:
Updated: 2026-11-03T23:47:02.249Z
Reserved: 2026-10-21T17:10:09.224Z
Link: CVE-2026-114550
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-04T00:17:22.783
Modified: 2026-11-04T00:17:22.783
Link: CVE-2026-114550
Redhat
No data.
OpenCVE Enrichment
No data.
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CWE-787
Out-of-bounds Write