The FoFiType1C::convertToType0 function in FoFiType1C.cc in Poppler 0.59.0 has a NULL pointer dereference vulnerability because a data structure is not initialized, which allows an attacker to launch a denial of service attack.
https://www.debian.org/security/2018/dsa-4079
https://lists.debian.org/debian-lts-announce/2017/11/msg00023.html