The QSvg module in Qt, as used in the Mumble client 1.2.x before 1.2.6, allows remote attackers to cause a denial of service (hang and resource consumption) via a local file reference in an (1) image tag or (2) XML stylesheet in an SVG file.
http://www.securityfocus.com/bid/67400
http://www.openwall.com/lists/oss-security/2014/05/15/4