The WebRequest API implementation in extensions/browser/api/web_request/web_request_api.cc in Google Chrome before 45.0.2454.85 does not properly consider a request's source before accepting the request, which allows remote attackers to bypass intended access restrictions via a crafted (1) app or (2) extension.
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1267183003/
https://code.google.com/p/chromium/issues/detail?id=510802
http://www.securitytracker.com/id/1033472
http://www.debian.org/security/2015/dsa-3351
http://rhn.redhat.com/errata/RHSA-2015-1712.html
http://lists.opensuse.org/opensuse-updates/2015-11/msg00013.html
http://lists.opensuse.org/opensuse-updates/2015-09/msg00029.html
http://googlechromereleases.blogspot.com/2015/09/stable-channel-update.html