NATS Server: Route API Auth Bypass (nats-io nats-server)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.37 % · percentile 31 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
Weaknesses (CWE)
- CWE-287 — Improper Authentication
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45
- https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6
- https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6
- https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3
- https://github.com/nats-io/nats-server/releases/tag/v2.11.16
- https://github.com/nats-io/nats-server/releases/tag/v2.12.7
- https://github.com/nats-io/nats-server/releases/tag/v2.14.0
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L | GitHub_M |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L | NVD · security-advisories@github.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-42375
- GCVE · GCVE-0-2026-58253
Affected configurations (NVD CPE)
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*< 2.11.16cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*≥ 2.12.0 < 2.12.7
Affected products
| Product | Versions |
|---|---|
| nats-io · nats-server | affected < 2.11.16 ; affected >= 2.12.0-preview.1, < 2.12.6 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |