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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4 Patch
- https://github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30 Patch
- https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · linuxfoundationNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
References 5
- https://github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4 Patch
- https://github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30 Patch
- https://github.com/nats-io/nats-server/releases/tag/v2.12.12 Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.3 Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g Mitigation, Vendor Advisory