Php Version: 5640 Vulnerabilities Link _hot_
Because 5.6.40 is EOL, any vulnerability discovered after Jan 2019 remains unpatched in this version. Notable examples:
There is no permanent security fix for PHP 5.6.40 other than upgrading. php version 5640 vulnerabilities link
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. Because 5
: A heap-based buffer over-read in mbstring regular expression functions. A remote attacker could send crafted multibyte sequences to cause a system compromise or crash. Because 5.6.40 is EOL