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

April 24, 2026 (updated May 13, 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/commit/be213bd3528727148bef2d523c89e95d1fd9c072
github.com/becheran/grid/releases/tag/v1.0.1
github.com/becheran/grid/security/advisories/GHSA-38c5-483c-4qqp
nvd.nist.gov/vuln/detail/CVE-2026-42199

Code Behaviors & Features

Detect and mitigate CVE-2026-42199 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →