I see you're looking for information on PHP version 5.6.40 vulnerabilities. Here's what I found:
mod_php), the php_stream_close function triggers a use-after-free via stream_filter_remove.The story of 5.6.40 is a warning: staying on unsupported software is no longer an option . To survive in a modern landscape of code injection and cryptographic failures , Old Faithful's administrators finally realized they had to let go of the past and upgrade to a supported version like PHP 8.x. php version 5640 vulnerabilities link