The shouldTreatAsUniqueOrigin function in platform/weborigin/SecurityOrigin.cpp in Blink, as used in Google Chrome before 46.0.2490.71, does not ensure that the origin of a LocalStorage resource is considered unique, which allows remote attackers to obtain sensitive information via vectors involving a blob: URL.
http://googlechromereleases.blogspot.com/2015/10/stable-channel-update.html
http://rhn.redhat.com/errata/RHSA-2015-1912.html
https://code.google.com/p/chromium/issues/detail?id=514076
https://security.gentoo.org/glsa/201603-09
https://src.chromium.org/viewvc/blink?revision=201022&view=revision
http://www.debian.org/security/2015/dsa-3376
http://www.securitytracker.com/id/1033816