Vulnerabilities CVE-2026-33217

CVE-2026-33217

High

Open

TLP:CLEAR

NATS allows MQTT clients to bypass ACL checks

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 7.1
EPSS Score ⓘ: 0.26%

17.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Confidence: 90%
Published: Mar 25, 2026
Last Modified: Aug 10, 2026

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