CVE-2026-33217

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

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33217.json

https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-15966

https://bugzilla.redhat.com/show_bug.cgi?id=2451446

https://advisories.nats.io/CVE/secnote-2026-07.txt

https://access.redhat.com/security/cve/CVE-2026-33217

https://access.redhat.com/errata/RHSA-2026:23345

https://access.redhat.com/errata/RHSA-2026:22347

https://access.redhat.com/errata/RHSA-2026:21769

Details

Source: Mitre, NVD

Named Vulnerability: GO-2026-4834Named Vulnerability: GHSA-jxxm-27vp-c3m5

Risk Information

CVSS v2

CVSS v3

EPSS