{"id":"CVE-2026-58253","aliases":["AZL-92259","BIT-nats-2026-58253","DEBIAN-CVE-2026-58253","EUVD-2026-42375","GHSA-38x3-76xf-cq45","JLSEC-2026-1153","UBUNTU-CVE-2026-58253"],"status":"published","title":"NATS Server: Route API Auth Bypass","description":"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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00368,"percentile":0.31001,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2026-07-08T19:43:13Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure Linux:3","package":"telegraf","fixed_in":["1.31.0-27"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"nats","fixed_in":["2.11.16","2.12.6"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"nats-server","fixed_in":["2.14.1-1"],"sources":["osv"]},{"ecosystem":"Julia","package":"nats_server_jll","fixed_in":["2.14.3+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"telegraf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.31.0-27"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"nats","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.16"},{"introduced":"2.12.0"},{"fixed":"2.12.6"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.1-1","2.10.16-1","2.10.18-1","2.10.24-1","2.10.27-1","2.10.3-1","2.10.4-1","2.10.7-1","2.12.4-1","2.12.6-1","2.14.1-1","2.14.3-1","2.14.6-1","2.15.1-1","2.9.10-1","2.9.19-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.27-1","2.12.4-1","2.12.6-1","2.14.1-1","2.14.3-1","2.14.6-1","2.15.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.14.1-1"}]}],"versions":["2.10.27-1","2.12.4-1","2.12.6-1"]},{"source":"osv","ecosystem":"Julia","package":"nats_server_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.14.3+0"}]}]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.19-1build1","2.10.3-1","2.10.4-1","2.10.7-1","2.10.7-1ubuntu0.1","2.10.7-1ubuntu0.2","2.10.7-1ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.24-1","2.10.27-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"nats-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.27-1","2.10.27-1build1","2.10.27-1ubuntu0.26.04.1~esm1"]}],"products":[{"vendor":"linuxfoundation","product":"nats-server"},{"vendor":"nats-io","product":"nats-server"}],"references":[{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.16","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.7","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.14.0","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58253","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58253.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-58253","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-58253","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58253","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-58253","title":"NATS Server: Route API Auth Bypass","description":"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.","status":"published","published":"2026-07-08T19:43:13.776Z","modified":"2026-07-09T13:35:24.068Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T13:47:28.691429Z"}],"euvd":[{"id":"EUVD-2026-42375","description":"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.","status":"published","published":"2026-07-08T19:43:13Z","modified":"2026-07-09T13:35:24Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T18:20:04.523855Z"}],"nvd":[{"id":"CVE-2026-58253","description":"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.","status":"published","published":"2026-07-08T20:16:54.943Z","modified":"2026-10-25T17:10:00.197Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:12:28.4135Z"}],"osv":[{"id":"CVE-2026-58253","title":"NATS Server: Route API Auth Bypass","description":"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.","status":"published","published":"2026-07-08T19:43:13.776Z","modified":"2026-10-28T02:30:22.61075692Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:45:12.016252Z"},{"id":"DEBIAN-CVE-2026-58253","description":"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.","status":"published","published":"2026-07-08T20:16:54.943Z","modified":"2026-10-26T12:02:37.219120116Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:45:57.590991Z"},{"id":"JLSEC-2026-1153","description":"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.","status":"published","published":"2026-08-03T19:08:57.739Z","modified":"2026-08-03T19:15:08.701683517Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"UBUNTU-CVE-2026-58253","description":"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.","status":"published","published":"2026-07-08T20:16:00Z","modified":"2026-07-15T19:45:32.271859728Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T16:56:41.911783Z"},{"id":"AZL-92259","title":"CVE-2026-58253 affecting package telegraf for versions less than 1.31.0-27","description":"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.","status":"published","published":"2026-07-08T20:16:54Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.880689Z"},{"id":"BIT-nats-2026-58253","title":"NATS Server: Route API Auth Bypass","description":"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.","status":"published","published":"2026-07-14T15:47:19.103Z","modified":"2026-09-29T10:00:04.746631008Z","updated_at":"2026-11-02T15:28:34.007508Z"}]}}