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CVE-2026-58211

MEDIUM
5.4
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-58211
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-29 17:09 UTC
Published
2026-07-08 20:16 UTC
Last updated
2026-07-08 20:16 UTC
Primary CWE
CWE-863
CWE-863: Incorrect Authorization
Vendor / Product
nats-io / nats-server
Sources
cve.org  ·  NVD

Severity & Metrics

5.4 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
nats-io nats-server — < 2.12.12, >= 2.14.0-RC.1, < 2.14.3
Weakness (CWE)
CWESourceDescription
CWE-863 cna CWE-863: Incorrect Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.4 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References (1)
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