CVE-2011-3379: PHP

High severity, CVSS 7.5. EPSS: 5% chance of exploitation in the next 30 days.

The is_a function in PHP 5.3.7 and 5.3.8 triggers a call to the __autoload function, which makes it easier for remote attackers to execute arbitrary code by providing a crafted URL and leveraging potentially unsafe behavior in certain PEAR packages and custom autoloaders.

Affected products

• PHP PHP: version 5.3.7 only; version 5.3.8 only

Published 2011-11-03. Last modified 2026-06-16.