Applications that dynamically resize, crop, or process images using the legacy GD library are exposed to memory allocation flaws.
Version 5.6.40 was released in January 2019, and it has many known security issues because it reached on December 31, 2018 (no more security patches).
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" . php version 5640 vulnerabilities link
While searching for , many sysadmins expect to find a single official PHP.net advisory. Here is the truth: PHP.net does not host a "Vulnerabilities for 5.6.40" page.
The most critical fact to understand is that PHP 5.6 reached its official . This means the PHP development team no longer provides any security patches or bug fixes for the language itself. Released on January 10, 2019, this was the
Tracked as , this vulnerability is found within the phar_detect_phar_fname_ext function. When a script parses a malicious archive file name, the PHAR reading function reads memory data past the actual buffer limits. This allows remote attackers to extract sensitive data from the server's active memory. Technical Comparison of Key Vulnerabilities
This page lists vulnerability statistics for CVEs published in the last ten years, if any, for PHP » PHP » 5.6. 40 . CVE Details Unsupported Branches - PHP The most critical fact to understand is that PHP 5
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
Here is the official migration link from PHP.net: