Poppler through 0.62 contains an out of bounds read vulnerability due to an incorrect memory access that is not mapped in its memory space, as demonstrated by pdfunite. This can result in memory corruption and denial of service. This may be exploitable when a victim opens a specially crafted PDF file.
https://usn.ubuntu.com/3757-1/
https://lists.debian.org/debian-lts-announce/2018/10/msg00024.html
https://cgit.freedesktop.org/poppler/poppler/commit/?id=004e3c10df0abda214f0c293f9e269fdd979c5ee
https://bugzilla.redhat.com/show_bug.cgi?id=1602838
https://bugzilla.novell.com/show_bug.cgi?id=CVE-2018-13988
https://access.redhat.com/errata/RHSA-2018:3505
https://access.redhat.com/errata/RHSA-2018:3140
https://access.redhat.com/errata/RHBA-2019:0327
http://packetstormsecurity.com/files/148661/PDFunite-0.62.0-Buffer-Overflow.html