Bug 2498254 (CVE-2026-58208) - CVE-2026-58208 github.com/nats-io/nats-server: NATS Server: Denial of Service due to incorrect MQTT-over-WebSocket request routing
Summary: CVE-2026-58208 github.com/nats-io/nats-server: NATS Server: Denial of Service...
Keywords:
Status: NEW
Alias: CVE-2026-58208
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2499585
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 21:02 UTC by OSIDB Bzimport
Modified: 2026-07-13 06:10 UTC (History)
0 users

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Description OSIDB Bzimport 2026-07-08 21:02:08 UTC 
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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