PDFium in Google Chrome prior to 55.0.2883.75 for Mac, Windows and Linux, and 55.0.2883.84 for Android incorrectly handled navigation within PDFs, which allowed a remote attacker to read local files via a crafted PDF file.
https://security.gentoo.org/glsa/201612-11
https://chromereleases.googleblog.com/2016/12/stable-channel-update-for-desktop.html