{"id":"CVE-2019-18978","aliases":["DEBIAN-CVE-2019-18978","DLA-2096-1","DLA-2389-1","DSA-4918-1","EUVD-2019-0758","GHSA-pf8f-w267-mq2h","UBUNTU-CVE-2019-18978","USN-4571-1"],"status":"published","title":"The rack-cors rubygem may allow directory traveral","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02462,"percentile":0.84575,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2019-11-14T20:21:24Z","modified":"2026-10-20T10:50:50Z","fixes":[{"ecosystem":"RubyGems","package":"rack-cors","fixed_in":["1.0.4"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"ruby-rack-cors","fixed_in":["1.1.1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"ruby-rack-cors","fixed_in":["1.1.1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"ruby-rack-cors","fixed_in":["1.1.1-1"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"ruby-rack-cors","fixed_in":["0.2.9-1+deb8u1"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"ruby-rack-cors","fixed_in":["0.4.0-1+deb9u2"],"sources":["osv"]},{"ecosystem":"Debian:10","package":"ruby-rack-cors","fixed_in":["1.0.2-1+deb10u1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"ruby-rack-cors","fixed_in":["0.4.0-1+deb9u2build0.16.04.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.4"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.1-1"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.9-1+deb8u1"}]}],"versions":["0.2.9-1"]},{"source":"osv","ecosystem":"Debian:9","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.0-1+deb9u2"}]}],"versions":["0.4.0-1","0.4.0-1+deb9u1"]},{"source":"osv","ecosystem":"Debian:10","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2-1+deb10u1"}]}],"versions":["1.0.2-1"]},{"source":"osv","ecosystem":"RubyGems","package":"rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.4"}]}],"versions":["0.1.0","0.1.1","0.2.0","0.2.2","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1","0.4.0","0.4.1","1.0.0","1.0.1","1.0.2","1.0.3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.0-1+deb9u2build0.16.04.1"}]}],"versions":["0.4.0-1","0.4.0-1+deb9u1build0.16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1-1","1.0.1-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ruby-rack-cors","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.0-1+deb9u2build0.16.04.1"}]}],"versions":["0.4.0-1","0.4.0-1+deb9u1build0.16.04.1"]}],"products":[{"vendor":"canonical","product":"ubuntu_linux"},{"vendor":"debian","product":"debian_linux"},{"vendor":"rack-cors_project","product":"rack-cors"}],"references":[{"url":"https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/02/msg00004.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/10/msg00000.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://usn.ubuntu.com/4571-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory","advisory"]},{"url":"https://www.debian.org/security/2021/dsa-4918","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18978","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pf8f-w267-mq2h"},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-18978","tags":["advisory"]},{"url":"https://github.com/cyu/rack-cors","tags":["package"]},{"url":"https://usn.ubuntu.com/4571-1","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2019-18978","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4571-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-18978","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-18978","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T20:21:24Z","modified":"2024-08-05T02:02:39.801Z","updated_at":"2026-11-02T14:32:23.485011Z"}],"euvd":[{"id":"EUVD-2019-0758","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T20:21:24Z","modified":"2024-08-05T02:02:39Z","updated_at":"2026-11-03T02:40:27.303586Z"}],"ghsa":[{"id":"GHSA-pf8f-w267-mq2h","title":"The rack-cors rubygem may allow directory traveral","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-15T20:26:59Z","modified":"2023-01-23T20:22:09Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:36:14.033357Z"}],"nvd":[{"id":"CVE-2019-18978","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T21:15:12.17Z","modified":"2026-06-17T02:25:39.227Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:05:37.024431Z"}],"osv":[{"id":"CVE-2019-18978","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T21:15:12.17Z","modified":"2026-10-20T10:50:50.762075954Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:11.673963Z"},{"id":"DEBIAN-CVE-2019-18978","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T21:15:12.17Z","modified":"2026-09-21T07:02:33.876562313Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:31.867036Z"},{"id":"GHSA-pf8f-w267-mq2h","title":"The rack-cors rubygem may allow directory traveral","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-15T20:26:59Z","modified":"2024-02-16T08:21:36.004949Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:52.891208Z"},{"id":"UBUNTU-CVE-2019-18978","description":"An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.","status":"published","published":"2019-11-14T21:15:00Z","modified":"2026-02-04T04:20:33.502315Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:20.325378Z"},{"id":"DLA-2096-1","title":"ruby-rack-cors - security update","status":"published","published":"2020-02-06T00:00:00Z","modified":"2026-03-09T01:18:45.268365Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DLA-2389-1","title":"ruby-rack-cors - security update","status":"published","published":"2020-10-01T00:00:00Z","modified":"2026-03-09T01:21:12.535625Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4918-1","title":"ruby-rack-cors - security update","status":"published","published":"2021-05-18T00:00:00Z","modified":"2026-03-09T02:09:18.054004Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"USN-4571-1","title":"ruby-rack-cors vulnerability","description":"It was discovered that rack-cors did not properly handle relative file\npaths. An attacker could use this vulnerability to access arbitrary files.\n","status":"published","published":"2020-10-05T18:20:07Z","modified":"2026-04-27T15:43:41.760388Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}