Daptin: ParseAcceptLanguage `_` separator bypass enables >250x CPU amplification via Accept-Language header in LanguageMiddleware

Summary Daptin's LanguageMiddleware registered as a global gin middleware calls golang.org/x/text/language.ParseAcceptLanguage on the raw Accept-Language header of every HTTP request without imposing any size or shape filter. The underlying parser has quadratic-time behaviour on long lists of...