CVE-2007-1649: PHP

High severity, CVSS 7.8. EPSS: 7.2% chance of exploitation in the next 30 days.

PHP 5.2.1 allows context-dependent attackers to read portions of heap memory by executing certain scripts with a serialized data input string beginning with S:, which does not properly track the number of input bytes being processed.

Affected products

• PHP PHP: version 5.2.1 only

Published 2007-03-24. Last modified 2026-06-16.