NULL pointer dereference in the _fields_add function in fields.c in libbibcore.a in bibutils through 6.2 allows remote attackers to cause a denial of service (application crash), as demonstrated by end2xml.Referenceshttps://drive.google.com/drive/u/1/folders/1qtq272m7jJaEUPGFLvyXmIl5zNJv7rd1
