An out of bounds read in PDFium in Google Chrome prior to 68.0.3440.75 allowed a remote attacker to perform an out of bounds memory read via a crafted PDF file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-9214
https://chromereleases.googleblog.com/2018/07/stable-channel-update-for-desktop.html