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, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.11.15 |
Related Weaknesses (CWE)
References
- https://advisories.nats.io/CVE/secnote-2026-14.txtMitigationVendor Advisory
- https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvvMitigationVendor Advisory
FAQ
What is CVE-2026-33247?
CVE-2026-33247 is a vulnerability with a CVSS score of 7.4 (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, if a nats-server is run with static credentials for all clients pr...
How severe is CVE-2026-33247?
CVE-2026-33247 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33247?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.