Nixpkgs security tracker
Untriaged
Permalink
CVE-2026-33217
7.1 HIGH
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): LOW
- User interaction (UI): NONE
- Scope (S): UNCHANGED
- Confidentiality impact (C): LOW
- Integrity impact (I): HIGH
- Availability impact (A): NONE
NATS allows MQTT clients to bypass ACL checks
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.
References
-
https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5 x_refsource_CONFIRM
-
https://advisories.nats.io/CVE/secnote-2026-07.txt x_refsource_MISC
Affected products
nats-server
- ==>= 2.12.0-RC.1, < 2.12.6
- ==< 2.11.15
Package maintainers
-
@derekcollison Derek Collison <derek@nats.io>
-
@swdunlop Scott W. Dunlop <swdunlop@gmail.com>