| CVE | Description | Impact | |------|-------------|--------| | | FastCGI (PHP-FPM) — specially crafted request causes 502 response and memory corruption | Remote Code Execution (RCE) under certain configurations | | CVE-2019-9641 | exif_read_data() — heap-based buffer over-read | Information disclosure / DoS | | CVE-2019-9021 | php_url_parse_ex() — invalid URL parsing leads to CRLF injection | HTTP response splitting, SSRF | | CVE-2019-9020 | xmlrpc_decode() — persistent use-after-free | RCE (theoretical, DoS confirmed) | | CVE-2016-1903 | imap_open() — improper argument filtering | RCE via mailbox name parameter (still present in 5.6.40) |
PHP 5.6.40 compiles against older cryptographic standards. It lacks native compatibility with modern TLS 1.3 features without heavy modifications, leaving connections susceptible to legacy cryptographic attacks if underlying OpenSSL libraries are outdated. Architectural Risks of Running PHP 5.6.40 php version 5640 vulnerabilities verified
Security experts from Zend and Influential Software emphasize that staying on PHP 5.6 is no longer a viable option for organizations. Current PHP Versions | The Evolution & History of PHP - Zend
Current PHP Versions | The Evolution & History of PHP - Zend php version 5640 vulnerabilities verified