This indicates an attack attempt to exploit an Integer Overflow Vulnerability in WebAssembly in Google Chrome.
The vulnerability is due to an error when the vulnerable software attempts to handle a maliciously crafted web page. An attacker can exploit this by tricking a user into visiting a malicious webpage and execute arbitrary code within the context of the application.
Google Chrome version 66.0.3359.117 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.