Php Version 5640 Vulnerabilities Verified Free Jun 2026

On Debian-based systems, the dpkg -l | grep php command will show the version of installed PHP packages. For Debian 8 "Jessie", a version of 5.6.40+dfsg-0+deb8u2 or higher would indicate that the fixes for the March 2019 vulnerabilities are in place. Updates addressing the issues from 2020 would be at version 5.6.40+dfsg-0+deb8u11 or higher.

The 5.6.40 release targeted specific vulnerabilities in PHP's core functionality, particularly within the Phar extension and compatibility layers. 1. Phar Buffer Overflow (CVE-2019-6977) Heap-based Buffer Overflow Component: ext/phar/phar_object.c Impact: Remote Code Execution (RCE)

High to Critical.

Invalid and uninitialized memory reads occurring inside exif_process_SOFn and exif_process_IFD_in_TIFF parsing functions.

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In PHP 5, the rand() and mt_rand() functions are not cryptographically secure. They are pseudo-random number generators (PRNGs) that are predictable if an attacker can observe enough output (like a generated CSRF token or password reset link).

PHP Vulnerabilities: Assessment, Prevention, and Mitigation - Zend On Debian-based systems, the dpkg -l | grep

Do not compile PHP 5.6.40 from the original 2019 upstream source. Instead, rely on enterprise Linux distributions or third-party repositories that offer commercial or community-driven backported security patches:

PHP 5.6.40 supports openssl_random_pseudo_bytes() . Use it for anything security-critical. PHP Vulnerabilities: Assessment