The Google V8 engine, as used in Google Chrome before 44.0.2403.89 and QtWebEngineCore in Qt before 5.5.1, allows remote attackers to cause a denial of service (memory corruption) or execute arbitrary code via a crafted web site.
https://codereview.chromium.org/1233453004
https://bugs.chromium.org/p/chromium/issues/detail?id=505374
http://www.nsfocus.net/index.php?act=advisory&do=view&adv_id=80
http://lists.opensuse.org/opensuse-updates/2015-12/msg00116.html
http://googlechromereleases.blogspot.com/2015/07/stable-channel-update_21.html
http://code.qt.io/cgit/qt/qtwebengine.git/tree/dist/changes-5.5.1