The Buffer::Set function in core/cross/buffer.cc in the O3D plug-in in Google Chrome OS before 26.0.1410.57 does not prevent uninitialized data from remaining in a buffer, which might allow remote attackers to obtain sensitive information via unspecified vectors.
https://code.google.com/p/chromium/issues/detail?id=227197
http://googlechromereleases.blogspot.com/2013/04/stable-channel-update-for-chrome-os.html