Operating systems like Red Hat Enterprise Linux (RHEL), AlmaLinux, or Ubuntu Pro often backport critical security fixes to older PHP packages included in their long-term support (LTS) repositories.
If you need the complete, up‑to‑date list of known CVEs affecting your PHP 5.6 environment, use these authoritative sources: php version 5640 vulnerabilities link
Migrating to a supported version of PHP (such as PHP 8.2 or 8.3) is the only definitive fix. Operating systems like Red Hat Enterprise Linux (RHEL),
PHP 5.6.40 is a special version in PHP's history—it's the final release of the entire PHP 5 branch. Released on January 10, 2019, it capped off a series that began with PHP 5.0 in 2004. But here's the critical catch: PHP 5.6 officially reached end-of-life (EOL) on December 31, 2018, meaning its developer community had already stopped offering security fixes before 5.6.40 came out. That's why , and this article gives you a clear, actionable guide: a complete list of vulnerabilities, their fixes, and a practical plan to move off PHP 5.6 for good. Released on January 10, 2019, it capped off
While it was rolled out as the final patch release to anchor the legacy PHP 5.6 branch, thousands of legacy enterprise applications, old WordPress sites, and unmaintained servers still run this version.