The goal of this conference is to advance the security, sustainability, and inclusivity of open-source (OS) ecosystems by facilitating interdisciplinary collaboration and dialogue. Through participation from academic researchers, industry experts, and community contributors, the conference aims to foster convergence across technical, social, and policy domains to address key challenges in OS development. Key outcomes will include a comprehensive post-conference report that is submitted for publication. This report will distill findings from the event into actionable tools, performance metrics, and design strategies for OS software security, borrowing from successful approaches in adjacent fields. To support practical implementation, the conference will also generate an openly available tutorial or checklist that guides OS developers through secure design practices. The video-recorded keynote sessions, annotated bibliographies, and edited transcripts will be made accessible to increase engagement, especially among students and early-career professionals. Together, these efforts are intended to strengthen the OS developer pipeline, inform future research, and support a more secure and collaborative open-source ecosystem. The Cyber Policy Initiative (CPI), in collaboration with the Harris School of Public Policy, will lead the planning and execution of a dynamic, two-day conference focused on open-source software and cybersecurity. Although much attention has been paid recent