{"schema_version":"1.9.0","id":"BIT-nats-2026-33217","published":"2026-03-27T17:45:15.042Z","modified":"2026-09-10T16:01:43.904681408Z","aliases":["CVE-2026-33217","GHSA-jxxm-27vp-c3m5","GO-2026-4834"],"summary":"NATS allows MQTT clients to bypass ACL checks","details":"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":[{"package":{"name":"nats","ecosystem":"Bitnami","purl":"pkg:bitnami/nats"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.15"},{"introduced":"2.12.0"},{"fixed":"2.12.6"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-33217.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}],"references":[{"type":"ADVISORY","url":"https://advisories.nats.io/CVE/secnote-2026-07.txt"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33217"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-33217"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451446"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33217.json"}],"database_specific":{"cpes":["cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"],"severity":"High"}}