CVE-2026-58211 | THREATINT

Description

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-08 | Updated 2026-07-08 | Assigner GitHub_M

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

< 2.12.12

affected

>= 2.14.0-RC.1, < 2.14.3

affected

References

github.com/...server/security/advisories/GHSA-hmmp-q8cx-v964

cve.org (CVE-2026-58211)

nvd.nist.gov (CVE-2026-58211)

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