Vulnerability Details CVE-2026-58211
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.1%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-58211
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cpe:2.3:a:linuxfoundation:nats-server:2.12.0
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cpe:2.3:a:linuxfoundation:nats-server:2.12.1
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cpe:2.3:a:linuxfoundation:nats-server:2.12.10
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cpe:2.3:a:linuxfoundation:nats-server:2.12.11
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cpe:2.3:a:linuxfoundation:nats-server:2.12.2
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cpe:2.3:a:linuxfoundation:nats-server:2.12.3
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cpe:2.3:a:linuxfoundation:nats-server:2.12.4
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cpe:2.3:a:linuxfoundation:nats-server:2.12.5
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cpe:2.3:a:linuxfoundation:nats-server:2.12.6
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cpe:2.3:a:linuxfoundation:nats-server:2.12.7
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cpe:2.3:a:linuxfoundation:nats-server:2.12.8
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cpe:2.3:a:linuxfoundation:nats-server:2.12.9
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cpe:2.3:a:linuxfoundation:nats-server:2.14.0
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cpe:2.3:a:linuxfoundation:nats-server:2.14.1
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cpe:2.3:a:linuxfoundation:nats-server:2.14.2