Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| nats-io / nats-server | affected < 2.11.15; affected >= 2.12.0-RC.1, < 2.12.6 |
CWE
CWE-256
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
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in NATS-Server, a high-performance server for the NATS.io messaging system. For MQTT deployments utilizing usercodes and passwords, the MQTT passwords were mistakenly categorized as non-authenticating identity statements (JSON Web Tokens - JWT). This misclassification leads to the exposure of these passwords through monitoring endpoints, enabling an attacker with access to these endpoints to gain sensitive information.
- 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