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.
[
{
"product": "Rack",
"vendor": "Rack",
"versions": [
{
"status": "affected",
"version": "2.0.6"
}
]
}
]