The chrome_pdf::CopyImage function in pdf/draw_utils.cc in the PDFium component in Google Chrome before 38.0.2125.101 does not properly validate image-data dimensions, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via unknown vectors.
https://codereview.chromium.org/519873002/
http://www.securityfocus.com/bid/70273
http://rhn.redhat.com/errata/RHSA-2014-1626.html
http://googlechromereleases.blogspot.com/2014/10/stable-channel-update.html