There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6. Specially crafted requests can cause the multipart parser to enter a pathological state, causing the parser to use CPU resources disproportionate to the request size.
{ "nvd_published_at": "2018-11-13T23:29:00Z", "cwe_ids": [ "CWE-400" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2020-06-16T21:40:04Z" }