GHSA-v722-jcv5-w7mc
NATS has MQTT plaintext password disclosure
At a glance
- Published
- Updated
- CVE
- CVE-2026-33216
- Aliases
- BIT-nats-2026-33216, GO-2026-4836
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Description
### Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The nats-server provides an MQTT client interface. ### Problem Description For MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. ### Affected Versions Any version before v2.12.6 or v2.11.15 ### Workarounds Ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
Affected packages
| Package | Versions |
|---|---|
| Go · github.com/nats-io/nats-server/v2 | introduced 0, fixed 2.11.15 |
| Go · github.com/nats-io/nats-server/v2 | introduced 2.12.0-RC.1, fixed 2.12.6 |
| Go · github.com/nats-io/nats-server | introduced 0 |
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33216 ADVISORY
- https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 WEB
- https://advisories.nats.io/CVE/secnote-2026-05.txt WEB
- https://github.com/nats-io/nats-server PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |