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.
{
"github_reviewed_at": "2020-03-31T15:28:17Z",
"severity": "CRITICAL",
"github_reviewed": true,
"cwe_ids": [
"CWE-444"
],
"nvd_published_at": "2020-03-12T13:15:00Z"
}