Because PHP 5.6.40 is no longer actively monitored by the community, many vulnerabilities discovered in newer versions (like PHP 7.x or 8.x) are never back-tested against 5.6.40. There is a high probability that modern exploits targeting memory management or input validation also affect PHP 5.6.40, but they remain "unverified" simply because the version is obsolete. Unsupported Branches - PHP
) discovered in later years often remain unpatched in 5.6.40 unless a third-party vendor provides backported fixes Cybersecurity Help Legacy Dependency Vulnerabilities php version 5640 vulnerabilities verified
PHP Version 5.6.40: Verified Vulnerabilities and the Risks of Outdated Code Because PHP 5
Below are confirmed CVEs (Common Vulnerabilities and Exposures) that affect PHP 5.6.40, based on NVD (NIST), PHP changelog, and security advisories. Moving to a supported version is the only
Moving to a supported version is the only way to permanently mitigate these verified security risks.