🔐 CVE Alert

CVE-2026-33216

HIGH 8.6

NATS has MQTT plaintext password disclosure

CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-256
Vendor nats-io
Product nats-server
Published Mar 25, 2026
Last Updated Jul 20, 2026
Stay Ahead of the Next One

Get instant alerts for nats-io nats-server

Be the first to know when new high vulnerabilities affecting nats-io nats-server are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

Affected Versions

nats-io / nats-server
< 2.11.15 >= 2.12.0-RC.1, < 2.12.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗
github.com: https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc github.com: https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 advisories.nats.io: https://advisories.nats.io/CVE/secnote-2026-05.txt access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33216 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2451448 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22347 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23345 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:21769