In Artifex MuPDF 1.12.0 and earlier, multiple use of uninitialized value bugs in the PDF parser could allow an attacker to cause a denial of service (crash) or influence program flow via a crafted file.
https://www.debian.org/security/2018/dsa-4334
https://security.gentoo.org/glsa/201811-15
https://bugs.ghostscript.com/show_bug.cgi?id=699086
https://bugs.ghostscript.com/show_bug.cgi?id=698904
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5610
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5609
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5603
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5600