Php Version 5640 Vulnerabilities Verified Today

PHP 5.6.40 in 2026 is a critical security risk. Although version 5.6.40 was the final "security fix" release for the PHP 5.6 branch, it reached official End-of-Life (EOL)

on December 31, 2018. Since then, no official security patches have been released by the PHP Group, leaving any newly discovered vulnerabilities completely unaddressed. Verified Vulnerabilities and Risks

The following vulnerabilities were patched in the transition to 5.6.40 or have been identified in the branch since its EOL: Heap-Based Buffer Overflows (CVE-2019-9023, CVE-2019-6977): Multiple issues in the

extensions allow unauthenticated remote attackers to execute arbitrary code or crash the system by sending crafted data (e.g., specific regular expressions or images). Out-of-Bounds Reads (CVE-2019-9021, CVE-2019-9024):

Vulnerabilities in the PHAR and XMLRPC extensions allow attackers to read sensitive information from the server's memory. Remote Code Execution (RCE):

Outdated versions are highly susceptible to RCE through unpatched bugs in core functions or extensions like Unpatched Dependency Chains:

Even if the PHP core is "stable," the underlying libraries (OpenSSL, libxml2) used by PHP 5.6.40 are likely also outdated and contain their own critical vulnerabilities. The Danger of "Hidden" Vulnerabilities

Because PHP 5.6.40 is no longer actively monitored by the community, many vulnerabilities discovered in newer versions (like PHP 7.x or 8.x) are never back-tested against 5.6.40. There is a high probability that modern exploits targeting memory management or input validation also affect PHP 5.6.40, but they remain "unverified" simply because the version is obsolete. Unsupported Branches - PHP

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 issues, it is now considered End of Life (EOL) and has not received official security updates since December 31, 2018. Verified Vulnerabilities in PHP 5.6.40

Although 5.6.40 fixed previous flaws, subsequent research and "forever day" vulnerabilities now affect any remaining installations. Key verified issues include:

Remote Code Execution (RCE): A use-after-free vulnerability in the phar_parse function (similar to CVE-2020-7063) allows unauthenticated remote attackers to execute arbitrary code by dereferencing freed pointers. php version 5640 vulnerabilities verified

Integer Underflow & Buffer Overflows: Vulnerabilities in PHP's core handling of memory allocation can lead to system crashes or memory corruption.

Out-of-Bounds Read Errors: Attackers can potentially leak sensitive information from the server's memory.

Vulnerable Dependencies: PHP 5.6.40 often interacts with outdated web components. For instance, the PHPGurukul Online Shopping Portal 2.1 (running on older PHP versions) was recently flagged for a critical SQL injection flaw (CVE-2026-5640) in April 2026. Why You Must Upgrade

Security experts from Zend and Influential Software emphasize that staying on PHP 5.6 is no longer a viable option for organizations.

Zero Security Support: No new patches are being released by the Official PHP Development Team.

Compliance Risks: Running EOL software often violates data protection regulations (like GDPR or PCI-DSS).

Performance Degradation: Modern versions (PHP 8.x) offer significantly faster execution speeds and better memory management compared to the 5.6 branch. Recommended Actions

Confirm Your Version: Use a phpinfo.php file to verify your current environment settings.

Audit Applications: Check for legacy scripts like forma.lms or other CMS platforms that may have specific exploits listed on Exploit-DB.

Upgrade to PHP 8.2 or 8.3: Moving to a supported version is the only way to permanently mitigate these verified security risks. Release Date: January 10, 2019 Support Status: End

Do you need help identifying specific legacy code in your application that might break during an upgrade to PHP 8?

PHP Vulnerabilities: Assessment, Prevention, and Mitigation - Zend

PHP version 5.6.40 was released on January 10, 2019, as the final scheduled security update for the PHP 5.6 branch. While it fixed several critical issues, it is now officially End-of-Life (EOL) and remains vulnerable to a variety of exploits identified since its release. Key Vulnerabilities in Versions Prior to 5.6.40

Version 5.6.40 was primarily a security release to patch the following verified vulnerabilities:

CVE-2019-9023 (Mbstring): Multiple heap-based buffer over-reads in multibyte regular expression functions that could lead to full system compromise.

CVE-2019-9021 (Phar): A heap-based buffer over-read in PHAR extension reading functions.

CVE-2019-9020 (Xmlrpc): A "Use After Free" vulnerability where invalid input to xmlrpc_decode() could cause memory corruption or information disclosure.

CVE-2016-10166 (GD): An integer underflow in the _gdContributionsAlloc function that could have "unspecified impact". The "Verified" Risk Today

Although 5.6.40 patched these specific bugs, running it today is highly discouraged by the PHP Development Team because: PHP 5.6.40 Release Announcement

PHP 5.6.40 was the final security release for the PHP 5.6 branch, aimed at patching several critical vulnerabilities before its official End of Life (EOL) on December 31, 2018. While it fixed many bugs, its EOL status means any vulnerabilities discovered after its release remain unpatched by the official PHP development team. Verified Vulnerabilities Fixed in 5.6.40 Critical & High Severity | CVE | Description

The following verified vulnerabilities were addressed in the PHP 5.6.40 release to encourage users to upgrade from previous 5.6.x versions:

Heap-based Buffer Over-read (CVE-2019-9021): A flaw in the PHAR extension could allow an attacker to read allocated or unallocated memory past the actual data by using a specially crafted filename.

Buffer Overflows in mbstring (CVE-2019-9023): Multiple instances of heap-based buffer overflows were found in multibyte string regular expression functions, potentially allowing a remote attacker to compromise a system via crafted regular expressions.

Out-of-Bounds Read in XMLRPC (CVE-2019-9020 & CVE-2019-9024): Improper memory operations in the xmlrpc_decode function and xmlrpc base64 code could lead to out-of-bounds reads, resulting in potential system compromise or sensitive information disclosure.

Heap-based Buffer Overflow (CVE-2019-6977): Found in the gdImageColorMatch function of the GD extension due to improper calculation of allocated buffer sizes. Critical Risks for PHP 5.6.40 Post-EOL

Because official support has ended, 5.6.40 is considered insecure for production use. Risks include: Every PHP Application Is Vulnerable

1. The Status of PHP 5.6.40

PHP 5.6.40 is significant because it was the last release before the PHP team ceased all active support and security patching for the 5.x branch.

Release Date: January 10, 2019
Support Status: End of Life (EOL)
Security Patching: Ceased
Verification Status: No further security fixes will be released. Any vulnerability discovered after January 2019 remains "unpatched" forever.

Critical & High Severity

| CVE | Description | Impact | |------|-------------|--------| | CVE-2019-11043 | FastCGI (PHP-FPM) — specially crafted request causes 502 response and memory corruption | Remote Code Execution (RCE) under certain configurations | | CVE-2019-9641 | exif_read_data() — heap-based buffer over-read | Information disclosure / DoS | | CVE-2019-9021 | php_url_parse_ex() — invalid URL parsing leads to CRLF injection | HTTP response splitting, SSRF | | CVE-2019-9020 | xmlrpc_decode() — persistent use-after-free | RCE (theoretical, DoS confirmed) | | CVE-2016-1903 | imap_open() — improper argument filtering | RCE via mailbox name parameter (still present in 5.6.40) |

Conclusion

The phrase "PHP version 5.6.40 vulnerabilities verified" serves as a warning. While 5.6.40 was a robust workhorse, it is now a liability. The vulnerabilities verified are not just bugs in the code, but the structural inability to defend against modern attack vectors.

Verdict: PHP 5.6.40 is unsafe for production environments handling user data or financial transactions. Upgrade is mandatory.