PHP version was the final release of the PHP 5.6 branch. While it contained many security patches at the time of its release in January 2019, it has since reached End of Life (EOL)
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 php version 5640 vulnerabilities link
Example Code:
CVE-2019-9024 (Severity: 7.5 High): Another out-of-bounds read in xmlrpc_decode related to base64 decoding. Post-5.6.40 Risks PHP version was the final release of the PHP 5