Vulnerability-Lookup

GHSA-4V7V-GQF9-WW2G

Vulnerability from github – Published: 2026-10-06 15:22 – Updated: 2026-10-06 15:22

Summary

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

Details

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:

@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.

Severity

6.9 (Medium)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "vyper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-682"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-06T15:22:23Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "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).",
  "id": "GHSA-4v7v-gqf9-ww2g",
  "modified": "2026-10-06T15:22:23Z",
  "published": "2026-10-06T15:22:23Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vyper: Call stack corruption when passing complex type containing non-base type members as argument"
}

Sightings

Author	Source	Type	Date	Other

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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