During March 2026, Daniel Song focused on security hardening for the meta-llama/PurpleLlama repository, addressing a critical Remote Code Execution vulnerability in the Canary Exploit Verification component. He replaced the use of eval with ast.literal_eval in Python to safely evaluate byte strings, mitigating the risk of arbitrary code execution while preserving existing API behavior. This targeted remediation, reviewed and merged after a security assessment, demonstrated Daniel’s expertise in Python programming, cybersecurity, and vulnerability assessment. The work improved runtime safety without introducing breaking changes, reflecting a thoughtful approach to secure software engineering and a deep understanding of secure code evaluation practices.