8.6highHigh
CVE-2026-33216
Linuxfoundation Nats-Server
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.
Exploitation status
- A vendor advisory or patch reference has been published.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 8.6 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N- Weakness
- CWE-256
- Assigned by
- security-advisories@github.com
Dates
- Published
- 2026-03-25
- Last modified
- 2026-08-24
- Sources
- NVD
Affected products
- Linuxfoundation Nats-Server- 2.11.15, 2.12.0 - 2.12.6
As listed in the NVD configuration data. Not a statement about your estate.
References
- https://advisories.nats.io/CVE/secnote-2026-05.txt
- https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099
- https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc
- https://access.redhat.com/errata/RHSA-2026:21769
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/security/cve/CVE-2026-33216
- https://bugzilla.redhat.com/show_bug.cgi?id=2451448
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json