      def process_cors(env)
        resource, error = match_resource(env)
        if resource
          Result.hit(env)
          cors = resource.to_headers(env)
          cors

        else
          Result.miss(env, error)
          nil
        end
      end
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.