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
Before providing links, we must address the typo. The correct version nomenclature is . The string "5640" is likely a concatenation error (removing the dots). In security research, precision matters. php version 5640 vulnerabilities link
The official U.S. government repository of standards-based vulnerability management data. End of Life (EOL) on December 31, 2018 PHP version 5
: The official PHP website often has a section on security where you can find information on known vulnerabilities, how to report them, and advisories. Severity: 7
// Request Analyzer function analyzeRequest($request) global $vulnerabilityDB; foreach ($vulnerabilityDB as $function => $vulnerability) if (preg_match($vulnerability['exploit_pattern'], $request)) // Block the request return false;
Run php -v today. If you see 5.6.40 , treat it as a critical incident. Your security audit links start here, but they must end with a migration plan.