If you are still using PHP 5.6.40 in 2026, the risks go far beyond the CVEs listed above.
The scanner confirms that your environment runs software with a known 100% attack surface that will never receive official upstream patches. Real-World Business Impacts Risk Factor Business Consequence
Glitches in how stream contexts handle peer validation can allow attackers to spoof remote APIs, leading to data interception. Real-World Exploitation Scenarios php version 5640 vulnerabilities verified
Restrict your PHP environment by disabling functions commonly chained with memory corruption vulnerabilities to achieve RCE. Edit your php.ini file:
The number of confirmed vulnerabilities in PHP versions prior to 5.6.40 is substantial. These are not theoretical risks but documented flaws with available public exploits and verification methods. Many security scanners, including Nessus and Tenable, have specific plugins (e.g., Plugin ID 121602) designed to detect these exact issues. The following are some of the most critical, verified vulnerabilities present in PHP 5.6.40 and earlier versions. If you are still using PHP 5
Week 1 — Foundation & Environment
A particularly severe bug is a type confusion vulnerability in the GMP extension of PHP 5.6.40 and all earlier versions. This bug allows an attacker to manipulate the structure of an object during the deserialization process, enabling them to rewrite properties of other objects in the script. Many security scanners, including Nessus and Tenable, have
This highly publicized vulnerability involves Nginx configurations using fastcgi_split_path_info . An attacker can manipulate the path info using newline characters ( %0a ), causing a buffer underflow in PHP-FPM. This allows the attacker to overwrite configuration parameters (like modules_set ) and force the server to execute arbitrary code via the PATH_INFO variable. 2. Fileinfo Read Out-of-Bounds (CVE-2019-11035) Type: Out-of-bounds Read Component: ext/fileinfo (libmagic) Impact: Information Disclosure / Denial of Service (DoS)
Because PHP 5.6.40 is the final version of the 5.x branch, all vulnerabilities discovered in the PHP core that apply to legacy architecture remain fully verified and exploitable on unpatched 5.6.40 installations. 1. PHP-FPM Remote Code Execution (CVE-2019-11043) Environment Variable Injection / Buffer Underflow Component: PHP-FPM (FastCGI Process Manager) Impact: Remote Code Execution (RCE)
When security researchers say a vulnerability is verified , they mean:
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