View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-4885 medium priority: Ubuntu including 1 source packages (php5), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 6.
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.