NATS Server: Route API Auth Bypass
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-58253US | — | — | ||
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 f… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6FIX
- https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6FIX
- https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3FIX
- https://github.com/nats-io/nats-server/releases/tag/v2.11.16ARTICLE
- https://github.com/nats-io/nats-server/releases/tag/v2.12.7ARTICLE
- https://github.com/nats-io/nats-server/releases/tag/v2.14.0ARTICLE
- https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-58253WEB
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