Php Version 5640 Vulnerabilities Verified ((install)) Jun 2026
grep -E "QfbMERGE|DEBUG|SECURITY|X-Auth-Token" /var/log/nginx/access.log grep -E "\.\./config|curl|wget|base64" /var/log/apache2/access.log
5.6.40 from an older 5.6 release, it does address these verified issues CVE-2016-10166 : A use-after-free vulnerability in imagescale (GD extension). CVE-2019-9023 : Multiple heap buffer overflows in regular expression functions. CVE-2019-9021 : Heap buffer overflow in phar_detect_phar_fname_ext (PHAR extension). CVE-2019-9020 : Heap out-of-bounds read in xmlrpc_decode() Security Guide & Mitigation
PCI-DSS and other compliance standards strictly forbid the use of unsupported software PHP 5.6: Why you should upgrade - Influential Software. php version 5640 vulnerabilities verified
PHP version 5.6.40 vulnerabilities have been verified, and it is essential to update to this version to protect your website from potential attacks. By understanding the nature of PHP vulnerabilities and taking proactive measures to secure your website, you can prevent data breaches, website disruption, and other security incidents. Remember to keep your PHP installation up-to-date, use a reputable PHP version, and monitor your website for suspicious activity.
If you are still using PHP 5.6.40 in 2026, the risks go far beyond the CVEs listed above. Remember to keep your PHP installation up-to-date, use
From a security scoring perspective, the cumulative vulnerabilities in PHP versions below 5.6.40 are severe. The CVSS v3 base score for the aggregated vulnerabilities, as reported by Tenable, is with the vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H . This score indicates:
Found in the xmlrpc_decode function, this allows unauthenticated remote attackers to cause a heap out-of-bounds read, potentially leading to system compromise. The version used in this analysis
This is a one-byte out-of-bounds read vulnerability, meaning the application reads data from one byte outside the intended memory buffer. While seemingly minor, it could potentially be chained with other vulnerabilities to leak sensitive information, such as memory addresses, which could then be used to bypass security mitigations like ASLR (Address Space Layout Randomization) or to cause a crash. For example, a crash log containing pointer addresses could give an attacker valuable insights.
Released on August 28, 2014, PHP 5.6 was the last major release in the PHP 5 series and introduced notable features such as constant scalar expressions, variadic functions, argument unpacking, and the phpdbg debugger. The version used in this analysis, 5.6.40, was released on January 10, 2019, as the final security release for the branch. The official End-of-Life (EOL) for PHP 5.6 occurred on December 31, 2018, which means that after this date, the PHP development team no longer provides official security patches. This status leaves users in a particularly dangerous position: newly discovered zero-day vulnerabilities will never be officially fixed by the PHP group, making all EOL versions a ticking time bomb for any live application.
This vulnerability was found in the sapi_read_post_data function within the CLI SAPI interface. It is a use-after-free vulnerability that could allow a remote attacker to pass specially crafted responses to the application, potentially leading to arbitrary code execution on the system.
These vulnerabilities are a stark reminder of the risks associated with running outdated software. This article provides a comprehensive analysis of the vulnerabilities verified and fixed in PHP version 5.6.40, serving as the ultimate guide to understanding the risks and migrating your systems.
