Use-after-free vulnerability in the fz_subsample_pixmap function in fitz/pixmap.c in Artifex MuPDF 1.10a allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted document.
https://bugs.ghostscript.com/show_bug.cgi?id=697515
https://blogs.gentoo.org/ago/2017/02/09/mupdf-use-after-free-in-fz_subsample_pixmap-pixmap-c/
http://www.securityfocus.com/bid/97111
http://git.ghostscript.com/?p=mupdf.git%3Bh=2c4e5867ee699b1081527bc6c6ea0e99a35a5c27