A double-eviction in the Incognito mode cache that lead to a user-after-free in cache in Google Chrome prior to 66.0.3359.139 allowed a remote attacker who had compromised the renderer process to execute arbitrary code via a crafted HTML page.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-17881
https://chromereleases.googleblog.com/2018/04/stable-channel-update-for-desktop_26.html