The URLRequest::GetHSTSRedirect function in url_request/url_request.cc in Google Chrome before 42.0.2311.90 does not replace the ws scheme with the wss scheme whenever an HSTS Policy is active, which makes it easier for remote attackers to obtain sensitive information by sniffing the network for WebSocket traffic.
https://security.gentoo.org/glsa/201506-04
https://code.google.com/p/chromium/issues/detail?id=455215
https://chromium.googlesource.com/chromium/src/net/+/2359906c4fdfa9d44b045755d23fe5327c10e010
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