Description (CNA)
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 `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| nats-io / nats-server | affected < 2.11.15; affected >= 2.12.0-RC.1, < 2.12.6 |
CWE
CWE-863
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5
- https://advisories.nats.io/CVE/secnote-2026-07.txt
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in NATS-Server. When Access Control Lists (ACLs) were configured for message subjects, these controls were not correctly applied within the `$MQTT.>` namespace. This oversight allows MQTT clients to bypass the intended ACL checks, potentially granting unauthorized access to sensitive message subjects. This vulnerability could lead to information disclosure or unauthorized message manipulation.
- 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
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/errata/RHSA-2026:21769