Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-58253

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 31.0%
CVSS Severity
CVSS v3 Score 8.8
Products affected by CVE-2026-58253


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