7.1highHigh
CVE-2026-33217
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, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
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, an ordinary user account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 7.1 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N- Weakness
- CWE-863
- 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-2026-07.txt
- https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5
- 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-2026-33217
- https://bugzilla.redhat.com/show_bug.cgi?id=2451446
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33217.json