In MuPDF 1.12.0, there is an infinite loop vulnerability and application hang in the pdf_parse_array function (pdf/pdf-parse.c) because EOF is not considered. Remote attackers could leverage this vulnerability to cause a denial of service via a crafted pdf file.
https://www.debian.org/security/2018/dsa-4334
https://security.gentoo.org/glsa/201811-15
https://lists.debian.org/debian-lts-announce/2019/06/msg00027.html