CVE-2026-33217

Published March 25th, 2026

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CVSS v3

7.1

HIGH

CVSS v2

N/A

Affected

PROJECT

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.

nats-io/nats-server

High-Performance server for NATS.io, the cloud and edge native messaging system.

GitHub

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