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, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
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-v722-jcv5-w7mc ↗
- https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 ↗
- https://advisories.nats.io/CVE/secnote-2026-05.txt ↗
- https://access.redhat.com/security/cve/CVE-2026-33216 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2451448 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.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 ↗