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CVE

CVE-2026-33216

NATS has MQTT plaintext password disclosure
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CVE

CVE-2026-33216

NATS has MQTT plaintext password disclosure

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

The nats-server provides an MQTT client interface.

Problem Description

For MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints.

Affected Versions

Any version before v2.12.6 or v2.11.15

Workarounds

Ensure monitoring end-points are adequately secured.

Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
C
H
U
8.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Related Resources

No items found.

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc, https://nvd.nist.gov/vuln/detail/CVE-2026-33216, https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099, https://advisories.nats.io/CVE/secnote-2026-05.txt, https://github.com/nats-io/nats-server

Severity

8.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.6
EPSS Probability
0.00048%
EPSS Percentile
0.15147%
Introduced Version
0,v2.0.0-20210125171120-4fd58efa8405,v2.2.0,v2.12.0-preview.1,v2.0.0-20191001014211-18a1702ba2ad,v2.1.2,v2.0.0-20190604014547-ed1901c79292,v2.0.0-RC14
Fix Available
2.11.15,v2.0.0-20260316121023-b5b63cfc35a5,v2.11.15,v2.12.6,1.35.2.1-r4,1.32.13.1-r7,1.33.9.1-r6,0.14.15-r1,2.5.27-r4,0.3.2-r0,0.6.3-r18,0.6.3-r16,0.19.1-r4,1.33.9.2.1-r3,1.34.5.2.1-r3,1.35.2.2.1-r3,1.33.10.2.3-r2,1.34.6.2.1-r2,1.35.2.2.1-r2,1.37.3-r6,1.38.1-r1

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