At the moment, Google isn't sharing any details about the bug:
Access to bug details and links may be kept restricted until a majority of users are updated with a fix. We will also retain restrictions if the bug exists in a third party library that other projects similarly depend on, but haven’t yet fixed.
Also, seriously, update your Chrome installs... like right this minute. #PSA— Justin Schuh ???? (@justinschuh) 6 maart 2019
Normally, your Chrome browser should update automatically to the latest version. But you can check or speed up the process via the Help - About Google Chrome menu.