As an EOL product, new vulnerabilities remain unpatched.
While this is an indirect vulnerability, it is a verified risk. Modern Composer packages now require PHP 7.4 or 8.x. Using PHP 5.6.40 forces developers to use outdated versions of libraries (like Guzzle, Laravel, or Symfony components). php version 5640 vulnerabilities verified
Because official support has ended, 5.6.40 is considered insecure for production use. Risks include: Every PHP Application Is Vulnerable As an EOL product, new vulnerabilities remain unpatched
An integer underflow in the _gdContributionsAlloc function in gd_interpolation.c can be triggered by remote attackers to cause unspecified impacts through the decrementing of variables. Critical Risk Factors As an EOL product
By following these best practices and staying informed about PHP vulnerabilities, you can ensure the security and integrity of your website and protect your users' sensitive data.