Multiple vulnerabilities has been discovered and corrected in php:

Integer overflow in the exif_process_IFD_TAG function in exif.c
in the exif extension in PHP 5.4.0beta2 on 32-bit platforms allows
remote attackers to read the contents of arbitrary memory locations or
cause a denial of service via a crafted offset_val value in an EXIF
header in a JPEG file, a different vulnerability than CVE-2011-0708
(CVE-2011-4566).

PHP before 5.3.9 computes hash values for form parameters without
restricting the ability to trigger hash collisions predictably, which
allows remote attackers to cause a denial of service (CPU consumption)
by sending many crafted parameters (CVE-2011-4885).

The updated packages have been patched to correct this issue.