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

April 24, 2026 (updated May 4, 2026)

An integer overflow in Grid::expand_rows() 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 get_unchecked() with an invalid index, resulting in Undefined Behavior.

References

github.com/advisories/GHSA-38c5-483c-4qqp
github.com/becheran/grid
github.com/becheran/grid/commit/be213bd3528727148bef2d523c89e95d1fd9c072
github.com/becheran/grid/security/advisories/GHSA-38c5-483c-4qqp
nvd.nist.gov/vuln/detail/CVE-2026-42199

Code Behaviors & Features

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