There is a NULL pointer dereference in the AnnotPath::getCoordsLength function in Annot.h in an Ubuntu package for Poppler 0.24.5. A crafted input will lead to a remote denial of service attack. Later Ubuntu packages such as for Poppler 0.41.0 are not affected.
https://usn.ubuntu.com/3647-1/
https://lists.debian.org/debian-lts-announce/2018/10/msg00024.html
https://bugs.freedesktop.org/show_bug.cgi?id=106408
https://access.redhat.com/errata/RHSA-2018:3505