vyper performs double eval of the slice args when buffer from adhoc locations

{
  "id": "102d25cf559f41b0724bb16734627a098d5c792d3c314b1a0902217d43ce9bc2",
  "url": "https://osv.dev/vulnerability/CVE-2024-32646",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vyper performs double eval of the slice args when buffer from adhoc locations",
    "summary": "Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `slice` builtin can result in a double eval vulnerability when the buffer argument is either `msg.data`, `self.code` or `.code` and either the `start` or `length` arguments have side-effects. It can be easily triggered only with the versions `<0.3.4` as `0.3.4` introduced the unique symbol fence. No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.",
    "evidence": "osv:CVE-2024-32646",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-32646",
      "aliases": [
        "CVE-2024-32646",
        "GHSA-r56x-j438-vw5m",
        "PYSEC-2024-207"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vyperlang/vyper",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e9db8d9f7486eae38f5b86531629019ad28f514e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.3.10"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.4.0rc6",
            "v0.4.0rc5",
            "v0.4.0rc4",
            "v0.4.0rc3",
            "v0.4.0rc2",
            "v0.4.0rc1",
            "v0.4.0b6",
            "v0.4.0b5",
            "v0.4.0b4",
            "v0.4.0b3",
            "v0.4.0b2",
            "v0.4.0b1",
            "v0.3.10",
            "v0.3.10rc5",
            "v0.3.10rc4",
            "v0.3.10rc3",
            "v0.3.10rc2",
            "v0.3.10rc1",
            "v0.3.9",
            "v0.3.8",
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "pre-release",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.16",
            "v0.2.15",
            "v0.2.14",
            "v0.2.13",
            "v0.2.12",
            "v0.2.11",
            "v0.2.10",
            "v0.2.9",
            "v0.2.8",
            "v0.2.7",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "0.2.1",
            "v0.2.0",
            "v0.1.0-beta.17",
            "v0.1.0-beta.16",
            "v0.1.0-beta.15",
            "v0.1.0-beta.14",
            "v0.1.0-beta.13",
            "v0.1.0-beta.12",
            "v0.1.0-beta.11",
            "v0.1.0-beta.10",
            "v0.1.0-beta.9",
            "v0.1.0-beta.8",
            "v0.1.0-beta.7",
            "v0.1.0-beta.6",
            "v0.1.0-beta.5",
            "v0.1.0-beta.3",
            "v0.1.0-beta.2",
            "v0.1.0-beta.1",
            "v0.0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-32646.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.430427157Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/32xxx/CVE-2024-32646.json",
        "https://github.com/vyperlang/vyper/security/advisories/GHSA-r56x-j438-vw5m",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-32646"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/32xxx/CVE-2024-32646.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-32646",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507063,
  "published_at": "2024-04-25T17:21:59.687+00:00"
}