write_and_read_gimp_2_6_format_unusual (gconstpointer data)
{
  Gimp *gimp = GIMP (data);

  gimp_write_and_read_file (gimp,
                            TRUE /*with_unusual_stuff*/,
                            TRUE /*compat_paths*/,
                            FALSE /*use_gimp_2_8_features*/);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.