Vulnerability Details CVE-2026-58254
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 34.6%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-58254
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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