GHSA-4v7v-gqf9-ww2g

Vyper: Call stack corruption when passing complex type containing non-base type members as argument

Published

2026-10-06

Modified

2026-10-06

Sources

github-advisory

Summary

### Impact When we pass a multi-dimensional array (like `[[1, 2], [3, 4]]`) as an argument to internal/external functions we get incorrect output. This is due to a stack management issue, because it was assumed that the size of each subtype of an array/struct is 32, which is not always correct. Example code: ```python @internal def test_input(arr: int128[2][1], i: int128) -> (int128[2][1], int128): return arr, i @external def test_values(arr: int128[2][1], i: int128) -> (int128[2][1], int128): return self.test_input(arr, i) ``` Please see #2183 for further information ### Patches This problem was fixed in #2184, and released as a part of [`v0.2.6`](https://github.com/vyperlang/vyper/releases/tag/v0.2.6).

Affected packages

Remediation: Upgrade to 0.2.6 or later.

References

• https://github.com/advisories/GHSA-4v7v-gqf9-ww2g