Bad cast in DevTools in Google Chrome on Win, Linux, Mac, Chrome OS prior to 66.0.3359.117 allowed an attacker who convinced a user to install a malicious extension to perform an out of bounds memory read via a crafted Chrome Extension.
https://access.redhat.com/errata/RHSA-2018:2282
https://chromereleases.googleblog.com/2018/04/stable-channel-update-for-desktop.html