The FoFiType1C::convertToType0 function in FoFiType1C.cc in Poppler 0.59.0 has a heap-based buffer over-read vulnerability if an out-of-bounds font dictionary index is encountered, which allows an attacker to launch a denial of service attack.
https://bugzilla.freedesktop.org/show_bug.cgi?id=102724
https://cgit.freedesktop.org/poppler/poppler/commit/?id=da63c35549e8852a410946ab016a3f25ac701bdf
https://lists.debian.org/debian-lts-announce/2017/11/msg00023.html