{"id":"CVE-2026-33216","title":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system","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, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-auth…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-256","CWE-213"],"vendor":"linuxfoundation","product":"nats-server","affected":["nats-server < 2.11.15","nats-server >= 2.12.0, < 2.12.6"],"patched":["nats-server 2.12.6"],"published":"2026-03-25","updated":"2026-09-09","sourceUpdated":"2026-09-09T13:19:22.887","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33216","references":[{"url":"https://advisories.nats.io/CVE/secnote-2026-05.txt","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21769","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:22347","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23345","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-33216","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451448","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33216"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33216"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-28T01:37:25.310195Z"},"epss":0.00365,"epssPercentile":0.30261,"ingestedAt":"2026-07-20T12:38:40.669Z","slug":"CVE-2026-33216","body":"## Overview\n\nNATS-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, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.\n\n## Affected\n\n- `nats-server < 2.11.15`\n- `nats-server >= 2.12.0, < 2.12.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `nats-server 2.12.6`\n\n## Vendor advisories\n\n- **RHSA-2026:22347** · Red Hat · fixed in: Multicluster Global Hub 1.4.5 · released 2026-06-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:22347)\n- **RHSA-2026:23345** · Red Hat · fixed in: Multicluster Global Hub 1.6.5 · released 2026-06-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:23345)\n- **RHSA-2026:21769** · Red Hat · fixed in: Red Hat multicluster global hub 1.5.3 · released 2026-05-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:21769)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}