PHP invalid has table value deletion vulnerability

Wrong element with same hash value but different class may be removed from hash table...

security flaw

zendhashdelkeyorindex in zendhash.c in PHP before 4.4.3 and 5.x before 5.1.3 can cause zendhashdel to delete the wrong element, which prevents a variable from being unset even when the PHP unset function is called, which might cause the variable's value to be used in security-relevant operations...