PHP version 5.6.40 was the final release of the PHP 5.6 branch, serving as a "last stand" for security on an aging architecture. While its release on January 10, 2019, was meant to address the final known critical flaws, it also marked the official End of Life (EOL) for the entire PHP 5 series. The Story of PHP 5.6.40: The Final Patch
Last updated: 2026-04-19
Disclaimer: Always verify vulnerabilities against your exact PHP version string using php -v and cross-reference with the NVD database. php version 5640 vulnerabilities link
Here are the authoritative links to search for PHP 5.6.40 vulnerabilities: PHP version 5