{"id":"GHSA-4v7v-gqf9-ww2g","summary":"Vyper: Call stack corruption when passing complex type containing non-base type members as argument","details":"### Impact\nWhen 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.\n\nExample code:\n```python\n@internal\ndef test_input(arr: int128[2][1], i: int128) -\u003e (int128[2][1], int128):\n    return arr, i\n\n@external\ndef test_values(arr: int128[2][1], i: int128) -\u003e (int128[2][1], int128):\n    return self.test_input(arr, i)\n```\n\nPlease see #2183 for further information\n\n### Patches\nThis problem was fixed in #2184, and released as a part of [`v0.2.6`](https://github.com/vyperlang/vyper/releases/tag/v0.2.6).","modified":"2026-10-06T15:30:03.646574259Z","published":"2026-10-06T15:22:23Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-10-06T15:22:23Z","nvd_published_at":null,"cwe_ids":["CWE-682"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-4v7v-gqf9-ww2g"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/issues/2183"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/pull/2184"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/commit/0be02b7331e8febe79d5a4218829c72e30417a29"},{"type":"PACKAGE","url":"https://github.com/vyperlang/vyper"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/releases/tag/v0.2.6"}],"affected":[{"package":{"name":"vyper","ecosystem":"PyPI","purl":"pkg:pypi/vyper"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.6"}]}],"versions":["0.1.0b1","0.1.0b10","0.1.0b11","0.1.0b12","0.1.0b13","0.1.0b14","0.1.0b15","0.1.0b16","0.1.0b17","0.1.0b2","0.1.0b3","0.1.0b4","0.1.0b5","0.1.0b6","0.1.0b7","0.1.0b8","0.1.0b9","0.2.1","0.2.2","0.2.3","0.2.4","0.2.5"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4v7v-gqf9-ww2g/GHSA-4v7v-gqf9-ww2g.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}