PHP version 5.6.40 was released on January 10, 2019, as the final security release for the PHP 5.6 branch. While it addressed several critical security bugs at the time, it reached its official , meaning it has not received official security updates or bug fixes for over seven years. Key Vulnerabilities in PHP 5.6.40
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
// Request Analyzer function analyzeRequest($request) global $vulnerabilityDB; foreach ($vulnerabilityDB as $function => $vulnerability) if (preg_match($vulnerability['exploit_pattern'], $request)) // Block the request return false; End of Life (EOL) on December 31, 2018 PHP version 5
In the quiet, humming rows of a forgotten data center, a server named "Old Faithful" still ran a relic: . Released on January 10, 2019, this was the final curtain call for the PHP 5.6 branch, a version that had powered the web for years but was now officially unsupported and "End of Life" . Risks of Remaining on 5
An issue in the _gdContributionsAlloc function could lead to unspecified remote impact. Risks of Remaining on 5.6.40
Because PHP 5.6.40 is no longer maintained, it is susceptible to vulnerabilities found in later versions of PHP that were never backported. A major example is , a critical remote code execution flaw in PHP-CGI on Windows that impacts all legacy versions. Security Documentation & Papers