CVE-2016-5768: PHP

Critical severity, CVSS 9.8. EPSS: 9.6% chance of exploitation in the next 30 days.

Double free vulnerability in the _php_mb_regex_ereg_replace_exec function in php_mbregex.c in the mbstring extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by leveraging a callback exception.

Affected products

• PHP PHP: up to and including 5.5.36; version 5.6.0 only; version 5.6.1 only; version 5.6.2 only; version 5.6.3 only; version 5.6.4 only; …

Published 2016-08-07. Last modified 2026-06-17.