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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jxxm-27vp-c3m5 NATS allows MQTT clients to bypass ACL checks
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 25 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 25 Mar 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title NATS allows MQTT clients to bypass ACL checks
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-25T20:08:22.861Z

Reserved: 2026-03-17T23:23:58.314Z

Link: CVE-2026-33217

cve-icon Vulnrichment

Updated: 2026-03-25T20:08:06.939Z

cve-icon NVD

Status : Received

Published: 2026-03-25T20:16:32.473

Modified: 2026-03-25T20:16:32.473

Link: CVE-2026-33217

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses