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PHP2Shell Flaws Allow Remote Code Execution in PHP Runtime, Patches Released

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The PHP Security Team issued emergency fixes on October 21, 2026, for two critical vulnerabilities collectively named PHP2Shell, both rated 9.2 out of 10 under CVSS v4.0. The flaws, CVE-2026-109618 and CVE-2026-109619, enable remote code execution through memory corruption and stale global state, requiring no user account or victim interaction. Because the issues lie in the PHP runtime itself rather than in individual plugins or frameworks, all PHP installations serving web requests are considered at risk, with Apache mod_php identified as the highest-risk configuration. Patched minimum releases are PHP 8.5.12, 8.4.27, 8.3.36, and 8.2.35, while PHP 8.1 and older are end-of-life and need upgrading or vendor backports. Administrators are advised to treat the runtime update as urgent, since application-level updates do not patch the underlying engine.

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