During March 2026, Twooster focused on improving the stability of the valkey-io/valkey repository by addressing a critical use-after-free vulnerability in the slot migration process. Working in C, they identified and fixed a bug in the generateSyncSlotsEstablishCommand function that previously caused crashes under load during slot migrations. Their approach involved careful memory management, particularly around buffer handling when sdscatfmt reallocates memory, ensuring safer operations during high-stress scenarios. The fix was validated through targeted load testing, reducing the risk of production crashes. Twooster’s work enhanced code safety and maintainability, contributing to the overall reliability of the valkey-server migration path.