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CVE-2026-58211

5.4 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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, a client could be registered as the configured no_auth_user through a parser path used when the first client operation was not CONNECT, bypassing user-level connection restrictions such as allowed_connection_types or proxy_required that normal authentication would apply. This issue is fixed in versions 2.14.3 and 2.12.12.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.4 · linuxfoundationNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

References 1