The VpxVideoDecoder::VpxDecode function in media/filters/vpx_video_decoder.cc in the vpxdecoder implementation in Google Chrome before 41.0.2272.76 does not ensure that alpha-plane dimensions are identical to image dimensions, which allows remote attackers to cause a denial of service (out-of-bounds read) via crafted VPx video data.
https://security.gentoo.org/glsa/201503-12
https://codereview.chromium.org/858303002
https://code.google.com/p/chromium/issues/detail?id=449958
http://www.ubuntu.com/usn/USN-2521-1
http://www.securityfocus.com/bid/72901
http://rhn.redhat.com/errata/RHSA-2015-0627.html
http://googlechromereleases.blogspot.com/2015/03/stable-channel-update.html