CVE-2026-58211

MediumCVSS 5.4/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-863

Affected software

Vendor	Product	Versions
nats-io	nats-server	< 2.12.12; >= 2.14.0-RC.1, < 2.14.3

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964Mitigation, Vendor Advisory

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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