The fill_xrgb32_lerp_opaque_spans function in cairo-image-compositor.c in cairo before 1.14.2 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a negative span length.
https://mail.gnome.org/archives/gnome-announce-list/2015-March/msg00047.html
https://bugzilla.redhat.com/show_bug.cgi?id=1318977
http://lists.opensuse.org/opensuse-updates/2016-04/msg00029.html