Vulnerability Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.11.16 |
Related Weaknesses (CWE)
References
- https://github.com/nats-io/nats-server/commit/013586288078def45a6788096924eb4d15Patch
- https://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c3Patch
- https://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7cPatch
- https://github.com/nats-io/nats-server/releases/tag/v2.11.16Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.12.7Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.0Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322Vendor Advisory
FAQ
What is CVE-2026-58251?
CVE-2026-58251 is a vulnerability with a CVSS score of 6.5 (MEDIUM). NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could b...
How severe is CVE-2026-58251?
CVE-2026-58251 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58251?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.