void FileBody::Dump(std::ostream& os, const std::string& prefix) const {
  os << prefix << "<file: " << path_.string() << ">" << std::endl;
}
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.