CVE-2026-58208 | THREATINT

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Problem types

CWE-248: Uncaught Exception

Product status

>= 2.14.0-RC.1, < 2.14.3

affected

< 2.12.12

affected

References

github.com/...server/security/advisories/GHSA-p957-7v2w-g93g

github.com/...ommit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4

github.com/...ommit/837536b98b3a9280b993282155ff2bdd3ca38c30

github.com/nats-io/nats-server/releases/tag/v2.12.12

github.com/nats-io/nats-server/releases/tag/v2.14.3

cve.org (CVE-2026-58208)

nvd.nist.gov (CVE-2026-58208)

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