CVE-2006-1990 php multiple issues (CVE-2006-1991)

CVE-2006-1990 - wordwrap integer overflow
An integer overflow issue was discovered in PHP.  This issue could
potentially lead to arbitrary code execution as it allows overwriting
an arbitrary section of memory with user supplied data.  The
exploitability of this issue will depend on how a user program is
written to accept and process data passed to the wordwrap function.

CVE-2006-1991 - substr_compare DoS
It is possible to cause an OOB memory read via an improperly issued
call to the substr_compare function.  The ability to exploit this
issue will depend on how a user program is written to pass invalid
data to the substr_compare function.

http://www.infigo.hr/en/in_focus/advisories/INFIGO-2006-04-02

This issue also affects FC4