Is CVE-2026-58208 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-58208?

CVE-2026-58208 has a CVSS v3 severity of MEDIUM (6.8).

Back

CVE-2026-58208

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.