The GIF decoder in QtGui in Qt before 5.3 allows remote attackers to cause a denial of service (NULL pointer dereference) via invalid width and height values in a GIF image.
https://bugs.kde.org/show_bug.cgi?id=333404
http://www.ubuntu.com/usn/USN-2626-1
http://www.securityfocus.com/bid/67087
http://lists.qt-project.org/pipermail/announce/2014-April/000045.html
http://lists.opensuse.org/opensuse-updates/2015-03/msg00068.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-May/132395.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134141.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134040.html