{"id":"CVE-2019-18978","details":"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.","aliases":["GHSA-pf8f-w267-mq2h"],"modified":"2026-07-08T05:54:58.136733321Z","published":"2019-11-14T21:15:12.170Z","database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*"],"extracted_events":[{"introduced":"16.04"},{"last_affected":"16.04"}],"source":"CPE_STRING","vendor_product":"canonical:ubuntu_linux"},{"source":"CPE_STRING","vendor_product":"debian:debian_linux","cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.0"},{"last_affected":"8.0"},{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"}]}]},"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/02/msg00004.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/10/msg00000.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4571-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4918"},{"type":"FIX","url":"https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d"},{"type":"FIX","url":"https://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cyu/rack-cors","events":[{"introduced":"0"},{"fixed":"e4d4fc362a4315808927011cbe5afcfe5486f17d"}],"database_specific":{"cpe":"cpe:2.3:a:rack-cors_project:rack-cors:*:*:*:*:*:ruby:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.0.4"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.9","v0.2.8","v0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.0","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18978.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}