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CVE-2026-33216
8.6 HIGH
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): NONE
- User interaction (UI): NONE
- Scope (S): CHANGED
- Confidentiality impact (C): HIGH
- Integrity impact (I): NONE
- Availability impact (A): NONE
NATS has MQTT plaintext password disclosure
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.
References
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https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc x_refsource_CONFIRM
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https://advisories.nats.io/CVE/secnote-2026-05.txt x_refsource_MISC
Affected products
nats-server
- ==>= 2.12.0-RC.1, < 2.12.6
- ==< 2.11.15
Package maintainers
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@derekcollison Derek Collison <derek@nats.io>
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@swdunlop Scott W. Dunlop <swdunlop@gmail.com>