A vulnerability has been identified and fixed in libzip:

The _zip_name_locate function in zip_name_locate.c in the Zip extension
in PHP before 5.3.6 does not properly handle a ZIPARCHIVE::FL_UNCHANGED
argument, which might allow context-dependent attackers to cause
a denial of service (application crash) via an empty ZIP archive
that is processed with a (1) locateName or (2) statName operation
(CVE-2011-0421).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct this issue.