Chrome and Chromium-based browser zero-day exploit that 'exists in the wild' has been patched but an estimated 4 billion people may still be affected

pcgamer.com:

In the on-going cat and mouse game that is modern cybersecurity, even the really big names in the industry can sometimes be caught by surprise. Google's software security team, the very super-spy sounding «The Threat Analysis Group», announced a hidden exploit in Chrome and Chromium-based browsers on November 24, and Google has since patched it along with a number of other security fixes. 

It may take some time for the update to spread to all affected devices, so it might be worth keeping a closer eye on your browser updates over the next few days and weeks to make sure you're using the very latest version.

Google is understandably keeping the details of the exploit, which it's labelled CVE-2023-6351, under wraps for now, but it has noted that it's an integer overflow issue in Skia, which is an open source 2D graphics library that Chrome and Chromium-based browsers like Edge and Opera use to draw 2D images like buttons, text and menus. Integer overflow exploits can be used to crash your browser and gain access, so the severity rating of «high» seems more than appropriate here.

Zero-day vulnerabilities are nothing new of course, and all major software developers keep a close eye on potential exploits in order to patch them before any opportunistic parties can take advantage of them. However, Google's admission that this exploit exists «in the wild» is somewhat concerning, as it suggests that it was possibly being used for nefarious purposes already.

While companies devote huge amounts of time and resources to closing holes and squashing bugs and potential exploits before they happen, it's inevitable that a few are going to slip through the cracks. As always, the best recommendation is to keep your software updated at all