Medium severity5.4OSV Advisory· Published Jul 8, 2026· Updated Jul 9, 2026
CVE-2026-58211
CVE-2026-58211
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.
Affected products
3v2.14.2, v2.12.11, v2.12.10, …+ 1 more
- (no CPE)range: v2.14.2, v2.12.11, v2.12.10, …
- (no CPE)range: <2.14.3, <2.12.12
- cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*Range: >=2.12.0,<2.12.12
Patches
Vulnerability mechanics
References
1- github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964nvdMitigationVendor Advisory
News mentions
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