Php Version 5640 Vulnerabilities Link High Quality Today

PHP version 5.6.40 was released on January 10, 2019, as the final security release for the PHP 5.6 branch. While it addressed several critical security bugs at the time, it reached its official End of Life (EOL) on December 31, 2018, meaning it has not received official security updates or bug fixes for over seven years. Key Vulnerabilities in PHP 5.6.40

Although 5.6.40 was a "security release," it remains vulnerable to numerous exploits discovered after its EOL. Because the PHP project no longer maintains this branch, any vulnerability found since 2019 remains unpatched in official builds.

Heap-Based Buffer Over-reads (CVE-2019-9023): This critical vulnerability occurs in mbstring regular expression functions when they are supplied with invalid multibyte data. It can allow a remote attacker to compromise the target system.

PHAR Reading Issues (CVE-2019-9021): A heap-based buffer over-read in the PHAR extension may allow attackers to read memory past actual data while parsing filenames.

Integer Underflow (CVE-2016-10166): An issue in the _gdContributionsAlloc function in gd_interpolation.c can have unspecified impacts via unauthenticated remote attacks. php version 5640 vulnerabilities link

Exposed phpinfo() Page: 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

Using PHP 5.6.40 in 2026 is considered high-risk. Automated scanners frequently identify hundreds of known vulnerabilities in environments running this version. Snyk - Vulnerability report for Docker php:5.6.40-apache

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.

4. CVE-2019-9640 (EXIF Parsing Denial of Service)

• Severity: 6.5 (Medium)
• Description: An uninitialized read in the EXIF parsing engine causes a crash. While not RCE, it allows a remote attacker to crash the PHP process repeatedly.
• Vulnerability Link: https://nvd.nist.gov/vuln/detail/CVE-2019-9640
• Note: This vulnerability exists in all PHP 5.6.x versions, including 5.6.40.

Subject Clarification: "5640" vs. "5.6.40"

If you are asking about PHP 5.6.40, you are looking at the final, now obsolete release of PHP 5.6 from January 10, 2019. If "5640" refers to a version string like 5.6.4.0 (an old alpha), that version has even more unpatched flaws. This post assumes the former, as it is the more common legacy system reference. PHP version 5

5. Immediate Recommended Actions

1. Upgrade immediately – Move to PHP 8.2 or 8.3 (actively supported). PHP 8.4 is the latest stable branch as of 2026.
2. If you cannot upgrade (legacy app):
   • Isolate the server from the public internet.
   • Use a WAF (Web Application Firewall) like ModSecurity with PHP 5.6 rules.
   • Run the legacy app in a locked-down Docker container with read-only filesystem.
   • Consider a paid extended support vendor (e.g., Zend, HeroDevs).
3. Scan your server for known exploits using:

   # Using Trivy (open source)
   trivy filesystem --scanners vuln /path/to/php-app --severity CRITICAL,HIGH
   

2. CVE-2019-11036 (Heap Buffer Underflow)

• Severity: 7.5 (High)
• Description: When processing EXIF image data, PHP 5.6.40 suffers from a heap buffer underflow that can lead to a crash or information disclosure.
• Vulnerability Link: https://nvd.nist.gov/vuln/detail/CVE-2019-11036
• Exploit: Public proof-of-concept exists (search Exploit-DB ID 48531).

Part 2: The Primary Link – Official CVE List for PHP 5.6.40

There is no single “master link” labeled "5640." Instead, you must look at the aggregate of Common Vulnerabilities and Exposures (CVEs) that affect version 5.6.40.

Introduction: The Ghost of PHP 5.6

If you have stumbled upon the search term "php version 5640 vulnerabilities link" , you are likely dealing with a legacy system running PHP 5.6.40—the very last official release of the PHP 5.x series, published on January 10, 2019.

Since then, this version has been End of Life (EOL) . No security patches, no bug fixes. For security professionals and system administrators, finding an accurate, linkable source of vulnerabilities for this version is not just an academic exercise; it is a damage assessment mission.

In this article, we will clarify the confusion around "5640," provide direct links to official vulnerability databases, list the most critical CVEs affecting PHP 5.6.40, and explain why these links represent a clear and present danger. Severity: 6

3. Summary of Risk

• PHP 5.6.40 is not safe for production on any internet-facing system.
• No vendor (including Red Hat, Debian, Ubuntu) provides security backports for 5.6.40 after its EOL date (some vendors had separate extended support, but it ended by ~2020).
• Attackers actively target known PHP 5.x vulnerabilities.

Link 1: The CVE Details Database

The most reliable, linkable resource is CVE Details. This site scrapes official NVD (National Vulnerability Database) data and filters by version.

Direct link for PHP 5.6 (including 5.6.40): https://www.cvedetails.com/version/171048/PHP-PHP-5.6.40.html

What you will find there:

• A table of 70+ known CVEs that apply to 5.6.40.
• Severity scores (CVSS v2 and v3).
• Exploit availability links (Metasploit, Exploit-DB).
• References to patch commits (which are irrelevant now, as there are no patches).