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Disable leafnode support if not needed.\n2. Restrict network connections to your leafnode port, if plausible without compromising the service offered.\n\n### References\n\n * This document is canonically: <https://advisories.nats.io/CVE/secnote-2026-10.txt>\n * GHSA advisory: <https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339>\n * MITRE CVE entry: <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33218>","state":0,"publishedAt":"2026-03-24T21:45:29+00:00","modifiedAt":"2026-09-10T03:51:00.7401045+00:00","affected":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.15"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.12.0-RC.1"},{"kind":"fixed","version":"2.12.6"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339","https://nvd.nist.gov/vuln/detail/CVE-2026-33218","https://advisories.nats.io/CVE/secnote-2026-10.txt","https://github.com/nats-io/nats-server"],"sourceUrl":"https://github.com/advisories/GHSA-vprv-35vv-q339","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-vprv-35vv-q339","identifiers":["GHSA-vprv-35vv-q339","BIT-nats-2026-33218","CVE-2026-33218","GO-2026-4837"]},"retained":false,"historicalAffected":[]},{"revision":"ca6b6f19c0d348f2b9c6b2fa12b72604","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4837","aliases":["BIT-nats-2026-33218","CVE-2026-33218","GHSA-vprv-35vv-q339"],"title":"NATS has pre-auth server panic via leafnode handling in github.com/nats-io/nats-server","description":"NATS has pre-auth server panic via leafnode handling in github.com/nats-io/nats-server","state":0,"publishedAt":"2026-03-26T20:33:05+00:00","modifiedAt":"2026-03-27T18:26:19.936468+00:00","affected":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.15"},{"kind":"introduced","version":"2.12.0-RC.1"},{"kind":"fixed","version":"2.12.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339","https://advisories.nats.io/CVE/secnote-2026-10.txt"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4837","license":"OSV · upstream source license applies","key":"osv:GO-2026-4837","identifiers":["GO-2026-4837","BIT-nats-2026-33218","CVE-2026-33218","GHSA-vprv-35vv-q339"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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