On October 21, 2026, the PHP project disclosed two critical memory-corruption vulnerabilities that can allow unauthenticated remote code execution. Both are fixed in PHP 8.5.12, 8.4.27, 8.3.36, and 8.2.35. Every PHP install serving web requests is in scope,
Responder Guidance for PHP2Shell (CVE-2026-109618 and CVE-2026-109619)
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