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Security Advisories

CVE-2026-33217

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-33217

Severity

7.1

High

CVSS V3

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Summary

NATS allows MQTT clients to bypass ACL checks

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the $MQTT.> namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

References

Affected packages

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