CVE-2011-0420
The grapheme_extract function in the Internationalization extension (Intl) for ICU for PHP 5.3.5 allows context-dependent attackers to cause a denial of service (crash) via an invalid size argument, which triggers a NULL pointer dereference.
Date published : 2011-02-18
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html