CVE-2026-33217
7.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nats-io | nats-server | < 2.11.15 | affected |
| nats-io | nats-server | >= 2.12.0-RC.1, < 2.12.6 | affected |
Weaknesses
- CWE-863: CWE-863: Incorrect Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
nats-server: github.com/nats-io/nats-server: NATS-Server: Access control bypass via unapplied ACLs in MQTT namespace
Additional References
- 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-2026:21769
- https://access.redhat.com/errata/RHSA-2026:23345
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5
- https://advisories.nats.io/CVE/secnote-2026-07.txt
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