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PHP-UP-2026 originates from the "php-up-2026" exploit framework released by security researcher J4ck3LSyN (Jλckλι), disclosing the PHP session.upload_progress heap UAF (CVE-2026-109618/109619). It is maintained by CFSD, BrokenSec, and C4b1NKr3W, with participation from Andrew Dorman and Arch&Yuki. The project serves as an experimental security research and PoC release platform, providing attack chain verification, symbol extraction, and mitigation recommendations, targeting security researchers, blue teams, and incident response teams.