High · published March 26, 2026
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
| Product | Versions | Fixed in |
|---|---|---|
| linuxfoundation/nats-server | < 2.11.15 | 2.11.15 |
| linuxfoundation/nats-server | ≥ 2.12.0, < 2.12.6 | 2.12.6 |