The parser in Google V8, as used in Google Chrome before 53.0.2785.113, mishandles scopes, which allows remote attackers to obtain sensitive information from arbitrary memory locations via crafted JavaScript code.
https://security.gentoo.org/glsa/201610-09
https://googlechromereleases.blogspot.com/2016/09/stable-channel-update-for-desktop_13.html
https://codereview.chromium.org/2077283004
http://www.securitytracker.com/id/1036826
http://www.securityfocus.com/bid/92942