{"id":"CVE-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":["GHSA-38x3-76xf-cq45"],"modified":"2026-07-10T04:02:54.311095692Z","published":"2026-07-08T19:43:13.776Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58253.json"},"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58253.json"},{"type":"ADVISORY","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58253"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nats-io/nats-server","events":[{"introduced":"0"},{"introduced":"ef5569d9005b1c12f4ef84a01932fcdd1cea8faa"},{"fixed":"8a6b7cd9ac62105dcc9db70e589932d3b2548b36"},{"fixed":"0e0639058e0d2d8fce0cc34941f9897da152ab32"},{"fixed":"7b81dd455ea95960090a84858c7662827948d1b6"},{"fixed":"8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6"},{"fixed":"b86147e81710a52b72a7f7275f91d69f723f5cb3"},{"fixed":"b4ce0f990e42bc6f24df0c40eafbc4c8a2ac5b6c"},{"fixed":"0cbd01caf8f29011c26273ff7662addd3830396a"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.11.16"},{"introduced":"2.12.0-preview.1"},{"fixed":"2.12.6"}]}}],"versions":["v2.14.0-RC.3","v2.14.0-RC.2","v2.14.0-RC.1","v2.11.15","v2.12.4","v2.12.6","v2.11.14","v2.12.5","v2.11.12","v2.12.5-RC.2","v2.12.5-RC.1","v2.11.12-RC.7","v2.12.4-RC.6","v2.11.12-RC.6","v2.12.4-RC.5","v2.11.12-RC.5","v2.12.4-RC.4","v2.12.2","v2.11.12-RC.4","v2.12.4-RC.3","v2.12.4-RC.2","v2.11.12-RC.3","v2.12.4-RC.1","v2.11.12-RC.2","v2.12.3","v2.11.12-RC.1","v2.11.11","v2.12.3-RC.5","v2.12.3-RC.4","v2.12.3-RC.3","v2.12.3-RC.2","v2.12.3-RC.1","v2.12.2-RC.4","v2.11.11-RC.4","v2.12.2-RC.3","v2.11.11-RC.3","v2.12.1","v2.12.2-RC.2","v2.11.11-RC.2","v2.11.11-RC.1","v2.12.2-RC.1","v2.11.10","v2.12.0","v2.12.1-RC.5","v2.12.1-RC.4","v2.12.1-RC.3","v2.12.1-RC.2","v2.12.1-RC.1","v2.11.10-RC.1","v2.11.9","v2.12.0-RC.6","v2.12.0-RC.5","v2.12.0-RC.4","v2.12.0-RC.3","v2.12.0-RC.2","v2.11.9-RC.3","v2.12.0-RC.1","v2.11.9-RC.2","v2.12.0-preview.2","v2.11.9-RC.1","v2.11.8","v2.11.8-RC.1","v2.11.7","v2.12.0-preview.1","v2.11.7-RC.3","v2.11.7-RC.2","v2.11.7-RC.1","v2.11.6","v2.11.6-RC.1","v2.11.5","v2.11.5-RC.4","v2.11.5-RC.3","v2.11.5-RC.2","v2.11.5-RC.1","v2.11.4","v2.11.4-RC.3","v2.11.4-RC.2","v2.11.4-RC.1","v2.11.3","v2.11.3-RC.2","v2.11.3-RC.1","v2.11.2","v2.11.2-RC.3","v2.11.2-RC.2","v2.11.2-RC.1","v2.11.0","v2.11.0-RC.5","v2.11.0-RC.4","v2.11.0-RC.3","v2.11.0-RC.2","v2.11.0-RC.1","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.22","v2.9.21","v2.9.20","v2.9.19","v2.9.18","v2.9.17","v2.9.16","v2.9.15","v2.9.14","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.3","v2.9.2","v2.9.1","v2.9.0","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.7.0-rc2","v2.7.0-rc1","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.0","v2.4.0","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.7","v2.1.6","v2.1.4","v2.1.2","v2.1.0","v2.0.4","v2.0.2","v2.0.0","v2.0.0-RC19","v2.0.0-RC14","v1.3.0","v1.2.0","v1.1.0","v1.0.6","v1.0.4","v1.0.2","v1.0.0","v0.9.6","v0.9.4","v0.9.2","v0.8.1","v0.8.0","v0.7.2","v0.7.0","v0.6.8","v0.6.6","v0.6.4","v0.6.2","v0.6.0","v0.5.6","v0.5.4","v0.5.2","v0.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58253.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L"}]}