Use after free in PDFium in Google Chrome prior to 64.0.3282.119 allowed a remote attacker to potentially exploit heap corruption via a crafted PDF file.
https://www.debian.org/security/2018/dsa-4103
https://chromereleases.googleblog.com/2018/01/stable-channel-update-for-desktop_24.html
https://access.redhat.com/errata/RHSA-2018:0265