CVE-2007-0988: Canonical Ubuntu Linux

Medium severity, CVSS 4.3. EPSS: 2.4% chance of exploitation in the next 30 days.

The zend_hash_init function in PHP 5 before 5.2.1 and PHP 4 before 4.4.5, when running on a 64-bit platform, allows context-dependent attackers to cause a denial of service (infinite loop) by unserializing certain integer expressions, which only cause 32-bit arguments to be used after the check for a negative value, as demonstrated by an "a:2147483649:{" argument.

Affected products

• Canonical Ubuntu Linux: version 5.10 only; version 6.06 only; version 6.10 only
• PHP PHP: from 4.0.0, before 4.4.5 (fixed in 4.4.5); from 5.0.0, before 5.2.1 (fixed in 5.2.1); version 4.0 only

Published 2007-02-20. Last modified 2026-06-16.