Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-58209

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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. 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 26.3%
CVSS Severity
CVSS v3 Score 4.3
Products affected by CVE-2026-58209


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