{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33217","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-17T23:23:58.314Z","datePublished":"2026-03-25T19:43:40.969Z","dateUpdated":"2026-03-25T20:08:22.861Z"},"containers":{"cna":{"title":"NATS allows MQTT clients to bypass ACL checks","problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5"},{"name":"https://advisories.nats.io/CVE/secnote-2026-07.txt","tags":["x_refsource_MISC"],"url":"https://advisories.nats.io/CVE/secnote-2026-07.txt"}],"affected":[{"vendor":"nats-io","product":"nats-server","versions":[{"version":"< 2.11.15","status":"affected"},{"version":">= 2.12.0-RC.1, < 2.12.6","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-03-25T19:49:48.934Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-jxxm-27vp-c3m5","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-25T20:07:59.832372Z","id":"CVE-2026-33217","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-25T20:08:22.861Z"}}]}}