Developed and integrated support for the __isoc23 variants of scanf, fscanf, and sscanf within the angr/angr repository, extending symbolic execution capabilities to cover modern ISO C23 standard library functions. This work involved creating new SimProcedures in Python that accurately invoke the corresponding __isoc23 libc interfaces, thereby improving the analysis of input-parsing code paths in contemporary codebases. Leveraging skills in library development, reverse engineering, and symbolic execution, the implementation followed established repository conventions to ensure maintainability and cross-platform compatibility. Documentation was provided to facilitate upstream review, addressing analysis gaps and enhancing vulnerability discovery for newer C standards.