GHSA-4HG4-9MF5-WXXQ

Vulnerability from github – Published: 2023-09-04 16:39 – Updated: 2026-09-17 19:24
VLAI
Summary
incorrect order of evaluation of side effects for some builtins
Details

Impact

The order of evaluation of the arguments of the builtin functions uint256_addmod, uint256_mulmod, ecadd and ecmul does not follow source order. • For uint256_addmod(a,b,c) and uint256_mulmod(a,b,c), the order is c,a,b. • For ecadd(a,b) and ecmul(a,b), the order is b,a.

Note that this behaviour is problematic when the evaluation of one of the arguments produces side effects that other arguments depend on.

Patches

https://github.com/vyperlang/vyper/pull/3583

Workarounds

When using builtins from the list above, make sure that the arguments of the expression do not produce side effects or, if one does, that no other argument is dependent on those side effects.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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": "0.3.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-41052"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-670"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-09-04T16:39:49Z",
    "nvd_published_at": "2023-09-04T18:15:08Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe order of evaluation of the arguments of the builtin functions `uint256_addmod`, `uint256_mulmod`, `ecadd` and `ecmul` does not follow source order.\n\u2022 For `uint256_addmod(a,b,c)` and `uint256_mulmod(a,b,c)`, the order is `c,a,b`.\n\u2022 For `ecadd(a,b)` and `ecmul(a,b)`, the order is `b,a`.\n\nNote that this behaviour is problematic when the evaluation of one of the arguments produces side effects that other arguments depend on. \n\n### Patches\nhttps://github.com/vyperlang/vyper/pull/3583\n\n### Workarounds\nWhen using builtins from the list above, make sure that the arguments of the expression do not produce side effects or, if one does, that no other argument is dependent on those side effects.",
  "id": "GHSA-4hg4-9mf5-wxxq",
  "modified": "2026-09-17T19:24:13Z",
  "published": "2023-09-04T16:39:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hg4-9mf5-wxxq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-41052"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/pull/3583"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/commit/78fa8dd8f91ba0cb26277eeffb585c68c83e7daa"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-168.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vyperlang/vyper"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "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": "incorrect order of evaluation of side effects for some builtins"
}



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