Authentication Bypass Vulnerability in NATS-Server by NATS.io
CVE-2026-33216

8.6HIGH

Key Information:

Vendor

Nats-io

Status
Nats-server
Vendor
CVE Published:
25 March 2026

What is CVE-2026-33216?

NATS-Server, a high-performance messaging system, has a vulnerability that allows for the incorrect handling of MQTT passwords. In versions earlier than 2.11.15 and 2.12.6, these passwords were misclassified as non-authenticating identity statements and could be exposed through monitoring endpoints. To mitigate this risk, users are advised to secure monitoring endpoints effectively and avoid exposing them to untrusted networks.

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Deploy the Patch

Affected Version(s)

nats-server < 2.11.15 < 2.11.15

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

References

https://github.com/nats-io/nats-server/security/advisorie...
x_refsource_CONFIRM
https://github.com/nats-io/nats-server/commit/b5b63cfc35a...
x_refsource_MISC
https://advisories.nats.io/CVE/secnote-2026-05.txt
x_refsource_MISC

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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