While 5.6.40 addressed several bugs from earlier 5.6.x versions, it remains susceptible to various vulnerabilities depending on the specific environment and extensions used:
Flaws in the xmlrpc_decode function could allow a remote attacker to cause a system compromise or read memory outside of allocated areas via specially crafted requests. php version 5640 vulnerabilities link
PHP 5.6.40 is a relatively old version of PHP, and while it's known that older versions may have vulnerabilities that have been discovered and patched in later versions, specific vulnerabilities can include: While 5
Running PHP 5.6.40 is not just a technical debt; it is a security incident waiting to happen. While the vulnerability links provided above can help you document the risks, the only responsible action is to formulate a migration plan. While not a vulnerability in the code itself, many legacy 5
While not a vulnerability in the code itself, many legacy 5.6.40 setups leave the phpinfo() page public, which discloses sensitive server information that aids in formulating Remote Code Execution (RCE) or Local File Inclusion (LFI) attacks. Security Risk Summary
When you search for , you are effectively searching for the security report of the last known state of PHP 5.6.
: Flaws in functions like gd_interpolation.c could allow remote attackers to cause unspecified impacts through crafted image data.