Php Version - 5640 Vulnerabilities Link
Utilize curated, paid repositories that offer custom security patches for legacy stacks. Step 3: Disable Vulnerable Functions
For a complete, real-time list of all Common Vulnerabilities and Exposures (CVEs) associated with this version, refer to these primary tracking links:
Staying on PHP 5.6 is no longer an option. The industry standard in 2026 is PHP 8.2 or higher, with 8.5 being the latest stable branch.
PHP 5.6.40 relies heavily on older implementations of OpenSSL (typically OpenSSL 1.0.1 or early 1.0.2 branches depending on the OS compilation). php version 5640 vulnerabilities link
This critical vulnerability occurs in mbstring regular expression functions when they are supplied with invalid multibyte data. It can allow a remote attacker to compromise the target system.
This page states unequivocally that . Version 5.6.40 was released after EOL. This means that any vulnerability discovered after January 2019 (including most CVEs listed above) is permanently unfixed in 5.6.40.
The XMLRPC decoding layer contains improper input validation logic. This page states unequivocally that
These are just a fraction of the ~250+ vulnerabilities reported since 5.6.40's EOL.
The PHAR (PHP Archive) built-in deployment tool has inherent parsing vulnerabilities.
If you cannot immediately upgrade your PHP environment due to legacy code dependencies, you must implement strict compensatory controls to reduce your attack surface. Step 1: Migration (The Best Solution) you are looking at the final
: Tiny cracks in how the server handled data, potentially allowing an attacker to crash the system.
If you are asking about , you are looking at the final, now obsolete release of PHP 5.6 from January 10, 2019. If "5640" refers to a version string like 5.6.4.0 (an old alpha), that version has even more unpatched flaws. This post assumes the former, as it is the more common legacy system reference.
As Cloudways reports, the stable landscape has evolved to . Staying on 5.6.40 means missing out on: