Incorrect handling of PDF filter chains in PDFium in Google Chrome prior to 70.0.3538.67 allowed a remote attacker to perform an out of bounds memory read via a crafted PDF file.
https://www.debian.org/security/2018/dsa-4330
https://security.gentoo.org/glsa/201811-10
https://chromereleases.googleblog.com/2018/10/stable-channel-update-for-desktop.html