PDFium, as used in Google Chrome before 43.0.2357.65, does not properly initialize memory, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.
https://security.gentoo.org/glsa/201506-04
https://code.google.com/p/chromium/issues/detail?id=468167
http://www.securitytracker.com/id/1032375
http://www.securityfocus.com/bid/74723
http://www.debian.org/security/2015/dsa-3267
http://lists.opensuse.org/opensuse-updates/2015-11/msg00015.html
http://lists.opensuse.org/opensuse-updates/2015-05/msg00091.html
http://googlechromereleases.blogspot.com/2015/05/stable-channel-update_19.html