https://www.cvedetails.com/version/171048/PHP-PHP-5.6.40.html
PHP 5.6.40 was released on January 10, 2019, as the final security release for the PHP 5.6 lifecycle [1]. This version marked the official End-of-Life (EOL) for the PHP 5.x branch [1]. Since that date, the PHP development team has not provided official security patches, bug fixes, or updates for this version [1].
Use tools like PHPCompatibility (for PHP_CodeSniffer) to scan your codebase for deprecated functions. php version 5640 vulnerabilities link
Weaknesses in how the engine processes malformed inputs, large file uploads, or complex recursive arrays can force the CPU into infinite loops or rapidly exhaust available system memory.
https://www.php.net/manual/en/migration83.php https://www
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PHP 5.6.40 Attack Surface ├── GD Graphics Library ───> CVE-2019-6977 (Heap-Based OOB Write) ├── MBSTRING Engine ───────> CVE-2019-9023 (Regular Expression Over-read) ├── PHAR Stream Wrapper ───> CVE-2019-9021 (Filename Parsing Memory Leak) └── XMLRPC Component ──────> CVE-2019-9020 / CVE-2019-9024 (Out-of-Bounds Read) This link or copies made by others cannot be deleted
// Patch Manager function applyPatch($patch) // Apply the patch // ...
This is a crucial point of confusion. Because PHP 5.6 is end-of-life, . However, long-term support (LTS) vendors like Debian have backported fixes to their specific php5 packages. This means that while your system may report PHP version 5.6.40, it could be a Debian-specific build (e.g., 5.6.40+dfsg-0+deb8u19 ) that contains additional, unofficial security patches.
No security patches have been released since January 2019. Over 200+ known, unpatched vulnerabilities exist for PHP 5.6.x that affect version 5.6.40. Using it today is a severe security risk.