A double-eviction in the Incognito mode cache that lead to a user-after-free in Networking Disk Cache in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to execute arbitrary code via a crafted HTML page.
https://access.redhat.com/errata/RHSA-2018:1195
https://chromereleases.googleblog.com/2018/04/stable-channel-update-for-desktop.html