CVE-2026-58253

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.

• CWE-287

• https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6Patch
• https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6Patch
• https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3Patch
• 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-38x3-76xf-cq45Vendor Advisory

Published

Jul 8, 2026

Last Modified

Jul 13, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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