Php Version 5640 Vulnerabilities Link ((new)) -

for this version, leaving it permanently exposed to any vulnerabilities discovered over the last several years. Critical Vulnerabilities in PHP 5.6.40

Replace deprecated features (like old mysql_* functions, which were completely removed) with modern alternatives like PDO or mysqli .

Systems running PHP 5.6.40 or earlier are susceptible to several high-impact exploits: PHP PHP 5.6.40 security vulnerabilities, CVEs php version 5640 vulnerabilities link

Although 5.6.40 was a "security release," it remains vulnerable to numerous exploits discovered after its EOL. Because the PHP project no longer maintains this branch, any vulnerability found since 2019 remains in official builds.

As of March 2026, only four PHP versions are actively supported: 8.2, 8.3, 8.4, and 8.5. Everything from PHP 8.1 and below is end- for this version, leaving it permanently exposed to

Step 2: Utilize Extended Lifecycle Support (If Upgrading Immediately is Impossible)

Fixed CVE-2019-9020 and CVE-2019-9024 , closing heap out-of-bounds reads during data decoding. Because the PHP project no longer maintains this

Users running versions prior to 5.6.40 are affected by several critical vulnerabilities that this specific release was designed to patch:

Please note that PHP 5.6.40 is an outdated version, and using it may expose your application to known security vulnerabilities. Upgrading to a newer PHP version is essential to ensure your application's security and stability.

By following these guidelines, you can help mitigate the vulnerabilities in PHP 5.6.40 and keep your server and applications secure.