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CVE-2026-33216

NATS has MQTT plaintext password disclosure

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-256
NVD MITRE
8.6CVSSHIGH
EPSS Score
0.3%
Top 81.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-256

Affected Products

nats-serverlinuxfoundation
Mixed
AI / ML / ml-framework
nats-servernats-io
On-prem
Databases / cache-message-queue
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest
nats-iooss-projectDatabases

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://advisories.nats.io/CVE/secnote-2026-05.txt
advisories.nats.io
https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099
github.com
https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc
github.com

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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