Worked on security hardening for the FirebirdSQL/firebird repository, focusing on the plugin loading subsystem. Addressed a critical path traversal vulnerability by implementing input validation for plugin names, ensuring that directory escape characters were rejected before constructing plugin paths. This C++ development effort leveraged knowledge of plugin architecture and security best practices to eliminate a potential attack vector that could have allowed unauthorized code execution or data exposure. By strengthening the plugin loading mechanism, the work improved system reliability and enhanced trust in the vendor and plugin ecosystem, demonstrating a methodical approach to risk reduction and robust software engineering within a complex codebase.