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.
{ "nvd_published_at": "2019-11-14T21:15:00Z", "cwe_ids": [ "CWE-22" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2019-11-15T20:26:35Z" }