In Artifex MuPDF 1.12.0 and earlier, multiple heap use after free bugs in the PDF parser could allow an attacker to execute arbitrary code, read memory, or cause a denial of service via a crafted file.
https://security.gentoo.org/glsa/201811-15
https://bugs.ghostscript.com/show_bug.cgi?id=698901
https://bugs.ghostscript.com/show_bug.cgi?id=698892
https://bugs.ghostscript.com/show_bug.cgi?id=698891
https://bugs.ghostscript.com/show_bug.cgi?id=698888
https://bugs.ghostscript.com/show_bug.cgi?id=698883
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5604
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5521
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5513