V8 is an open source JavaScript engine used primarily in Chrome and Node.js. It was developed by Google, and powers many of today’s key productivity apps, such as Google Docs, or Gmail.

That said, CVE-2025-5419, which was patched Monday in Chrome 137.0.7151.68/.69 for Windows and Mac and 137.0.7151.68 for Linux, is the third zero-day flaw fixed in Chrome this year.