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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
nats-io nats-server
< 2.11.15affected>= 2.12.0-RC.1, < 2.12.6affected
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5 ↗
- https://advisories.nats.io/CVE/secnote-2026-07.txt ↗
- https://access.redhat.com/security/cve/CVE-2026-33217 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2451446 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33217.json ↗
- https://access.redhat.com/errata/RHSA-2026:22347 ↗
- https://access.redhat.com/errata/RHSA-2026:23345 ↗
- https://access.redhat.com/errata/RHSA-2026:21769 ↗