Is CVE-2026-114550 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-114550 being exploited in the wild.

How severe is CVE-2026-114550?

High severity, with a CVSS score of 8.1, published 4 November 2026.

Is there a fix for CVE-2026-114550?

Yes: fixed in libwebsockets (commit c9e8e1834d7f13038c82963086b90e2ee9c5b44c or later). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-114550 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-114550?

Check whether you run Libwebsockets. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-114550: libwebsockets MQTT PUBACK packet out-of-bounds write

CVE-2026-114550 · Severity: high · CVSS 8.1 · Published 2026-11-04

libwebsockets is a library used in network applications to implement the WebSocket and MQTT protocols. A flaw in how it processes MQTT PUBACK (acknowledgment) packets allows a remote attacker to write data beyond allocated memory boundaries, enabling arbitrary code execution without requiring authentication or user interaction.

Quick answers

Is CVE-2026-114550 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-114550 being exploited in the wild.
How severe is CVE-2026-114550?: High severity, with a CVSS score of 8.1, published 4 November 2026.
Which products and versions are affected?: libwebsockets.
Is there a fix for CVE-2026-114550?: Yes: fixed in libwebsockets (commit c9e8e1834d7f13038c82963086b90e2ee9c5b44c or later). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-114550 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-114550?: Check whether you run Libwebsockets. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: libwebsockets (commit c9e8e1834d7f13038c82963086b90e2ee9c5b44c or later)

Technical details

An out-of-bounds write vulnerability exists in the MQTT protocol parser's handling of PUBACK packets due to insufficient validation of packet data. The vulnerability resides in lib/roles/mqtt/mqtt.c and can be triggered remotely over the network by sending a malformed PUBACK packet. An unauthenticated attacker can exploit this to achieve code execution in the context of the affected process.

Affected products

libwebsockets

Timeline

2026-07-16: disclosed: Vulnerability reported to vendor
2026-10-26: advisory: Coordinated public release of advisory ZDI-26-792
2026-10-26: patched: Fix available via GitHub commit

References

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