{"schema_version":"1.9.0","id":"BIT-nats-2026-33218","published":"2026-03-27T17:45:16.655Z","modified":"2026-09-08T08:47:41.568004954Z","aliases":["CVE-2026-33218","GHSA-vprv-35vv-q339","GO-2026-4837"],"summary":"NATS has pre-auth server panic via leafnode handling","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, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.","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-2026-33218.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"references":[{"type":"ADVISORY","url":"https://advisories.nats.io/CVE/secnote-2026-10.txt"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33218"},{"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-2026-33218"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451450"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33218.json"}],"database_specific":{"cpes":["cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"],"severity":"High"}}