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🔗 https://www.cvedetails.com/version/266766/PHP-PHP-5.6.40.html
This page is the best single reference for all CVEs that affect 5.6.40.
Would you like an exported CSV of these CVEs or help interpreting any specific vulnerability?
Understanding PHP 5.6.40: Vulnerabilities and Risks Running PHP 5.6.40 in a modern production environment is a significant security risk. Released on January 10, 2019, version 5.6.40 was the final security release for the PHP 5.6 branch. Official security support for this branch ended on December 31, 2018.
Because this version is End-of-Life (EOL), any vulnerabilities discovered after its final release remain unpatched by the official PHP development team. Core Vulnerabilities in PHP 5.6.40
Although 5.6.40 was a "security release" intended to fix known issues, it remains susceptible to several critical flaws identified at the time of its release and many more discovered since.
In the quiet, humming rows of a forgotten data center, a server named "Old Faithful" still ran a relic: PHP version 5.6.40. Released on January 10, 2019, this was the final curtain call for the PHP 5.6 branch, a version that had powered the web for years but was now officially unsupported and "End of Life".
For a long time, Old Faithful felt secure. After all, 5.6.40 was a "security release." It had been patched to fix multiple vulnerabilities that plagued earlier 5.6.x versions, including integer underflow, buffer overflows, and out-of-bounds read errors. It was the fortress built to withstand the dying days of an era.
But as years passed, the world outside changed. The CVD (Common Vulnerabilities and Exposures) database began to list new shadows:
Memory Corruption: Tiny cracks in how the server handled data, potentially allowing an attacker to crash the system.
Input Validation Flaws: Silent doors left ajar where malicious actors could slip in unauthorized commands.
Denial of Service (DoS): Overwhelming the server until it could no longer serve its users. php version 5640 vulnerabilities link
The real danger wasn't just in the code itself, but in what it connected to. Old Faithful sat on an unpatched SQL Injection vulnerability (CVE-2026-5640) within its shopping portal software, allowing remote attackers to manipulate database queries and steal customer data. Other critical flaws, like CVE-2023-5640, had reached a "Critical" CVSS score of 9.8, meaning the wall was virtually gone.
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 Vulnerabilities: Assessment, Prevention, and Mitigation - Zend
The Risks of Using Outdated PHP: Understanding Version 5.6.40 Vulnerabilities and the Importance of Upgrading
PHP is one of the most widely used programming languages on the web, powering millions of websites and web applications. However, like any software, PHP is not immune to security vulnerabilities. In this article, we'll focus on PHP version 5.6.40, a version that has been identified as having several vulnerabilities. We'll explore the risks associated with using outdated PHP versions, the specific vulnerabilities found in version 5.6.40, and why upgrading to a newer version is crucial for maintaining the security and integrity of your website.
The Evolution of PHP and the Importance of Updates
PHP has undergone significant changes and improvements over the years. From its early days as a simple scripting language to its current status as a robust and feature-rich language, PHP has evolved to meet the growing demands of web development. One of the key aspects of PHP's development is its commitment to security. The PHP development team continuously works to identify and patch vulnerabilities, ensuring that newer versions of the language are more secure than their predecessors.
However, this commitment to security means that older versions of PHP, like version 5.6.40, eventually become outdated and vulnerable to known security threats. When a PHP version reaches the end of its life (EOL), it no longer receives security updates or patches, leaving websites that use it exposed to potential security risks.
PHP Version 5.6.40 Vulnerabilities
PHP version 5.6.40, released in 2018, is one such version that has reached its EOL. This version, like many others before it, had its share of vulnerabilities. Some of the notable vulnerabilities found in PHP 5.6.40 include: 🔗 https://www
These vulnerabilities, and others like them, were patched in later versions of PHP. However, since PHP 5.6.40 is no longer supported, websites using this version are left to fend for themselves, exposed to these known security risks.
The Risks of Using Outdated PHP Versions
Using an outdated PHP version like 5.6.40 poses significant risks to your website and its users. Some of the potential consequences include:
The Benefits of Upgrading to a Newer PHP Version
Upgrading to a newer PHP version is essential for maintaining the security and integrity of your website. Some of the benefits of upgrading include:
Conclusion
Using an outdated PHP version like 5.6.40 poses significant risks to your website and its users. The known vulnerabilities in this version, and others like it, can be exploited by attackers to gain unauthorized access to your website, leading to potential security breaches, malware infections, and other malicious activities. Upgrading to a newer PHP version is essential for maintaining the security and integrity of your website, and it also provides access to new features, improvements, and better support. Don't wait until your website is compromised – upgrade to a newer PHP version today and ensure the security and trust of your users.
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By taking the necessary steps to upgrade to a newer PHP version, you can ensure the security and integrity of your website, protect your users, and maintain compliance with best practices in web development.
Note on Terminology: The exact string "5640" does not correspond to any official PHP version (e.g., 5.6.40 is a real version, often typed as 5.6.40). Given the context of security research and typos, this article addresses PHP 5.6.40 (the final release of the PHP 5.x branch) and explains how to find verified vulnerability links. These vulnerabilities, and others like them, were patched
By [Your Name/Organization] Date: [Current Date]
If you are reading this, you likely maintain a legacy application or have encountered a server still running PHP 5.6.40.
Let’s get straight to the point: PHP 5.6.40 is the final release of the PHP 5.6 branch, and it is End-of-Life (EOL).
Released in January 2019, this version was the last gasp of the PHP 5 era. While it may keep your legacy code running, it represents a significant security liability. In this post, we break down the vulnerability landscape of PHP 5.6.40, where to find the data, and why you need an exit strategy immediately.
Because 5.6.40 is EOL, any vulnerability discovered after Jan 2019 remains unpatched in this version. Notable examples:
| CVE ID | Description | CVSS |
|--------|-------------|------|
| CVE-2019-11043 | Remote code execution via env request variable (PHP-FPM) – unpatched in 5.6.40 | 9.8 (Critical) |
| CVE-2019-9641 | Buffer overflow in php_url_parse_ex – DoS/RCE | 7.5 (High) |
| CVE-2019-9020 | XML parsing vulnerability in libxml2 affecting PHP | 7.5 |
| CVE-2018-20783 | Buffer over-read in php_escape_html_entities | 7.5 |
| CVE-2016-10712 | Use-after-free in stream_get_filters | 7.5 |
Full list from CVE Details shows many more critical issues (RCE, SQL injection via PDO, path traversal, etc.).
Instead of browsing a static link, use automated vulnerability scanners that return dynamic results.
While searching for "php version 5640 vulnerabilities link" , many sysadmins expect to find a single official PHP.net advisory. Here is the truth: PHP.net does not host a "Vulnerabilities for 5.6.40" page.
Instead, they provide a critical link:
Direct link to the PHP 5.6.40 EOL announcement: https://www.php.net/eol.php
This page states unequivocally that security fixes for PHP 5.6 ceased on December 31, 2018. Version 5.6.40 was released after EOL. This means that any vulnerability discovered after January 2019 (including most CVEs listed above) is permanently unfixed in 5.6.40.