{"id":"BIT-nats-2026-58253","summary":"NATS Server: Route API Auth Bypass","details":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.","aliases":["CVE-2026-58253","GHSA-38x3-76xf-cq45"],"modified":"2026-09-08T08:47:35.893548501Z","published":"2026-07-14T15:47:19.103Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:nats:nats_server:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3"},{"type":"ARTICLE","url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16"},{"type":"ARTICLE","url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7"},{"type":"ARTICLE","url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58253"}],"affected":[{"package":{"name":"nats","ecosystem":"Bitnami","purl":"pkg:bitnami/nats"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.16"},{"introduced":"2.12.0"},{"fixed":"2.12.6"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-58253.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L"}]}],"schema_version":"1.9.0"}