The _asn1_check_identifier function in GNU Libtasn1 causes a NULL pointer dereference and crash when reading crafted input that triggers assignment of a NULL value within an asn1_node structure. It may lead to a denial of service attack. Product bug: https://bugzilla.redhat.com/show_bug.cgi?id=1464141
Created libtasn1 tracking bugs for this issue: Affects: fedora-all [bug 1473195] Created mingw-libtasn1 tracking bugs for this issue: Affects: epel-7 [bug 1473196] Affects: fedora-all [bug 1473194]