ExcelReaderFactory.CreateBinaryReader throws OutOfMemoryException after trying to open a 26KB invalid Excel file for more than 25s. The file can be found in the attached archive. You can run the following code to reproduce it (the path variable should contain the path to the extracted file):

Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

using (var file = File.OpenRead(path))
{
  ExcelReaderFactory.CreateBinaryReader(file);
}

Found via SharpFuzz.