CVE-2026-42199 Grid: Integer Overflow in Grid::expand_rows Leads to Safe-API Undefined Behavior
An integer overflow in the Rust grid library allows attackers to trigger undefined behavior via safe API calls, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42199?
CVE-2026-42199 is a medium-severity vulnerability in becheran grid, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-190
Which versions are affected by CVE-2026-42199?
2 open source packages ship an affected version, including grid.
| Package | Affected | Fixed in |
|---|---|---|
grid crates.io | From 0.17.0 | 1.0.1 |
grid crates.io | From 0.17.0 | 1.0.1 |
How do I fix CVE-2026-42199?
Upgrade grid to 1.0.1 or later.
Is CVE-2026-42199 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42199 exists.
Sources
Also known as GHSA-38c5-483c-4qqp.