  def load_file(filename)
    Gem.load_yaml

    yaml_errors = [ArgumentError]
    yaml_errors << Psych::SyntaxError if defined?(Psych::SyntaxError)

    return {} unless filename and File.exist? filename

    begin
      content = Gem::SafeYAML.load(File.read(filename))
      unless content.kind_of? Hash
        warn "Failed to load #{filename} because it doesn't contain valid YAML hash"
        return {}
      end
      return content
    rescue *yaml_errors => e
      warn "Failed to load #{filename}, #{e}"
    rescue Errno::EACCES
      warn "Failed to load #{filename} due to permissions problem."
    end

    {}
  end
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.