Apple Safari WebKit PCRE Handling Integer Overflow Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari. User interaction is required to exploit this vulnerability in that the target must visit a malicious page. The specific flaw exists in the regular expression compiler (JavaScriptCore/pcre/pcre_compile.cpp) in WebKit. When nesting regular expressions with large repetitions, a heap overflow occurs resulting in a condition allowing the execution of arbitrary code.