Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-58214

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, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 28.8%
CVSS Severity
CVSS v3 Score 4.3
Products affected by CVE-2026-58214


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