During April 2026, Junrong focused on security and reliability improvements in critical open-source tooling. In the radareorg/radare2 repository, Junrong developed a Base64-encoded variant for the fN command using C, enabling secure handling of realnames during pdb loading and mitigating command injection risks. For the NationalSecurityAgency/ghidra project, Junrong addressed a PKI authentication vulnerability in Java by enforcing strict signature validation, rejecting null signatures to prevent authentication bypasses. These contributions demonstrated depth in backend and command line interface development, applying security best practices to enhance input handling and authentication integrity in widely used, security-sensitive development environments.