Medium severity6.8OSV Advisory· Published Jul 8, 2026· Updated Jul 9, 2026
CVE-2026-58208
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.
Affected products
1- Range: v2.14.2, v2.12.11, v2.12.10, …
Patches
Vulnerability mechanics
References
5- github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4nvdPatch
- github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30nvdPatch
- github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93gnvdMitigationVendor Advisory
- github.com/nats-io/nats-server/releases/tag/v2.12.12nvdRelease Notes
- github.com/nats-io/nats-server/releases/tag/v2.14.3nvdRelease Notes
News mentions
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