Worked on enhancing security detection in the google/oss-fuzz repository by addressing a critical issue in the PySecSan Regex DoS detector. Focused on improving the reliability of vulnerability detection, the developer analyzed and corrected the hook wiring for re.pattern.findall, shifting from a pre-execution to a post-execution hook. This adjustment ensured that the detector accurately identifies Regex DoS vulnerabilities, reducing missed cases and false negatives across fuzzing targets. The solution was implemented in Python, leveraging skills in bug fixing, code analysis, and security analysis. The change stabilized the detection pipeline and laid groundwork for broader security coverage in future releases.