Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.11.15 |
Related Weaknesses (CWE)
References
- https://advisories.nats.io/CVE/secnote-2026-05.txtMitigationVendor Advisory
- https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bPatch
- https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mcMitigationVendor Advisory
FAQ
What is CVE-2026-33216?
CVE-2026-33216 is a vulnerability with a CVSS score of 8.6 (HIGH). 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...
How severe is CVE-2026-33216?
CVE-2026-33216 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33216?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.