An issue was discovered in Artifex MuPDF before 1912de5f08e90af1d9d0a9791f58ba3afdb9d465. The pdf_run_xobject function in pdf-op-run.c encounters a NULL pointer dereference during a Fitz fz_paint_pixmap_with_mask painting operation. Versions 1.11 and later are unaffected.
https://security.gentoo.org/glsa/201706-08
http://www.debian.org/security/2017/dsa-3797
http://git.ghostscript.com/?p=mupdf.git%3Bh=1912de5f08e90af1d9d0a9791f58ba3afdb9d465