In Twisted Web through 20.3.0, there was an HTTP request splitting vulnerability. When presented with a content-length and a chunked encoding header, the content-length took precedence and the remainder of the request body was interpreted as a pipelined request.
{ "nvd_published_at": "2020-03-12T13:15:00Z", "cwe_ids": [ "CWE-444" ], "severity": "CRITICAL", "github_reviewed": true, "github_reviewed_at": "2020-03-31T15:28:17Z" }