CVE-2026-42199 Grid: Integer Overflow in Grid::expand_rows Leads to Safe-API Undefined Behavior

Grid is a data structure grid for rust. From version 0.17.0 to before version 1.0.1, an integer overflow in Grid::expandrows can corrupt the relationship between the grid’s logical dimensions and its backing storage. After the internal invariant is broken, the safe API get may invoke getunchecked...