Vulnerability Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Nats-Server | < 2.11.17 |
Related Weaknesses (CWE)
References
- https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fdPatch
- https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfaePatch
- https://github.com/nats-io/nats-server/releases/tag/v2.11.17Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.12.8Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67Vendor Advisory
FAQ
What is CVE-2026-58250?
CVE-2026-58250 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 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with c...
How severe is CVE-2026-58250?
CVE-2026-58250 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-2026-58250?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.