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6.8 Medium

CVE-2026-58208 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system

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.

Affected products and versions

Product Affected versions Fixed in
nats-server 2.14 2.14.0-RC.1 → < 2.14.3 2.14.3
nats-server 2.12 earliest → < 2.12.12 2.12.12

References

Timeline

  1. Published
  2. Last modified

Other CVEs of nats-server

The 27 CVEs of nats-server →
CVE-2026-58211 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system 5.4 Medium CVE-2026-58207 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system 7.7 High CVE-2026-58210 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system 7.5 High CVE-2026-58209 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system 4.3 Medium
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