A researcher published exploit code for a vulnerability in WebKit, the web browser engine that powers Apple’s Safari, along with other apps on iOS, iOS, and Linux. The vulnerability takes advantage of an optimization error with WebKit’s matching of regular expressions, which could end with the possibility to execute arbitrary shellcode. An unskilled attacker would not find the bug practical because Safari’s sandbox protection should prevent code to run outside the browser. Since Chrome relies on the V8 engine, it is not affected by the bug.
Source: https://www.bleepingcomputer.com/news/security/webkit-vulnerability-affects-latest-versions-of-apple-safari/