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 for the entire PHP 5 series. The Story of PHP 5.6.40: The Final Patch
The exact string "5640" does not correspond to any official PHP version (e.g., 5.6.40 is a real version, often typed as 5.6.40). Given the context of security research and typos, this article addresses PHP 5.6.40 (the final release of the PHP 5.x branch) and explains how to find verified vulnerability links. php version 5640 vulnerabilities link
There is no official PHP version "5.6.40" in the standard PHP release history. The official versions were 5.6.39 and then 5.6.40 (Release Date: Jan 10, 2019). However, given the high likelihood of a typo, this post covers PHP 5.6.40 (the last official security release of the 5.6 branch) and also addresses the possibility you meant the 5.6.4.0 alpha build or a general search for CVE links. PHP version 5
PHP version 5.6.40 was the final security release for the PHP 5.6 branch. While its release in early 2019 fixed several critical issues, it is now officially and has not received official security patches since late 2018. Critical Vulnerabilities Fixed in 5.6.40 Given the context of security research and typos,