Vulnerability Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.12.12 |
Related Weaknesses (CWE)
References
- https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edPatch
- https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862aPatch
- https://github.com/nats-io/nats-server/releases/tag/v2.12.12Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.3Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qgVendor Advisory
FAQ
What is CVE-2026-58210?
CVE-2026-58210 is a vulnerability with a CVSS score of 7.5 (HIGH). NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large inc...
How severe is CVE-2026-58210?
CVE-2026-58210 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58210?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.