The ContainerNode::parserRemoveChild function in core/dom/ContainerNode.cpp in the HTML parser in Blink, as used in Google Chrome before 42.0.2311.90, allows remote attackers to bypass the Same Origin Policy via a crafted HTML document with an IFRAME element.
https://src.chromium.org/viewvc/blink?revision=190980&view=revision
https://security.gentoo.org/glsa/201506-04
https://code.google.com/p/chromium/issues/detail?id=456518
http://www.securitytracker.com/id/1032209
http://www.debian.org/security/2015/dsa-3238
http://ubuntu.com/usn/USN-2570-1
http://rhn.redhat.com/errata/RHSA-2015-0816.html
http://lists.opensuse.org/opensuse-updates/2015-11/msg00024.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00040.html
http://googlechromereleases.blogspot.com/2015/04/stable-channel-update_14.html