# OWASP Core Rule Set (CRS) v4.25.0 Vulnerability Fix Summary ## Vulnerability Overview This update primarily addresses multiple **file upload detection bypass** vulnerabilities, specifically targeting **whitespace padding bypass** attack techniques. Key fixes include: * **PHP Double-Encoding Upload Bypass:** Patched vulnerability allowing whitespace padding to bypass PHP double-encoding upload detection (fix#393111). * **PHP File Upload Detection Bypass:** Patched vulnerability enabling whitespace padding to bypass PHP file upload detection (fix#393112). * **ZPP File Upload Detection Bypass:** Patched vulnerabilities allowing whitespace padding to bypass ZPP file upload detection (fix#4540, fix#393140, fix#393141). * **AI-Based Patch Expansion:** Enhanced AI-driven patch detection capabilities (fix#39130). ## Affected Scope * **Software Version:** OWASP Core Rule Set (CRS) versions prior to v4.25.0. * **Affected Components:** File upload detection rules, particularly those related to PHP and ZPP format file uploads. ## Remediation * **Upgrade Recommendation:** Upgrade to **v4.25.0 (LTS)** or a higher version. * **Related Fix Commits:** #4547, #4548, #4549, #4552, #4553, #4554, etc. ## POC/Exploit Code No specific POC code or exploit scripts are provided in the release notes.