If you are currently running PHP 5.6.40, I can help you find resources to check your or calculate the risks of not upgrading. Let me know what framework (like WordPress) you are using! PHP Object Injection - OWASP Foundation
Supported versions (8.2, 8.3, 8.4, 8.5) receive regular updates for new vulnerabilities.
The official U.S. government repository of standards-based vulnerability management data. php version 5640 vulnerabilities link
Some notable CVEs that affect 5.6.40:
PHP has undergone significant changes and improvements over the years. From its early days as a simple scripting language to its current status as a robust and feature-rich language, PHP has evolved to meet the growing demands of web development. One of the key aspects of PHP's development is its commitment to security. The PHP development team continuously works to identify and patch vulnerabilities, ensuring that newer versions of the language are more secure than their predecessors. If you are currently running PHP 5
PHP version 5.6.40 was released on January 10, 2019 , as a final security release for the 5.6 branch. While 5.6.40 itself addressed several issues, it has since reached its official End of Life (EOL)
These vulnerabilities, and others like them, were patched in later versions of PHP. However, since PHP 5.6.40 is no longer supported, websites using this version are left to fend for themselves, exposed to these known security risks. The official U
: A global out-of-bounds memory read error within the module's base64 encoding sub-parser. Environmental and Downstream Risks
The dangers of running PHP 5.6.40 extend beyond native language bugs. Legacy environments usually depend on outdated operating systems and companion packages: PHP 5.6: Why you should upgrade - Influential Software
https://www.php.net/ChangeLog-5.php#5.6.40
Attackers can leverage an out-of-bounds read error in the base64 parsing code of XML-RPC to view unallocated memory areas. 4. PHAR Extension Buffer Over-Read