PHP Session Upload Progress Advisory: CVE-2026-115560 Mitigation and Scope
PHP published an informational notice on October 23, 2026, about CVE-2026-115560, which applies only when the session serialize handler is set to php_binary or php_serialize and then changed at runtime to php before session_start() with session upload progress enabled. PHP describes remote code execution through this path as unlikely and recommends disabling upload progress until the next regular bugfix release, while noting that applications that never change the handler at runtime can keep it enabled. A full advisory is promised, but no complete list of affected versions or CVSS score has been published yet, and cPanel has said affected versions remain unknown. Red Hat states the recommended mitigation is fully protective and gives guidance for enforcing it in FPM and Apache. A ZoomEye search for app="PHP" returned about 111 million PHP fingerprint matches, which reflects general PHP deployment rather than confirmed vulnerable systems.
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