Security Advisory

CVE-2026-58208

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 20:17:39

Last updated 2026-07-09 14:04:28

Assigner GitHub_M

CVSS score 6.8

State PUBLISHED

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.

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