Security advisory

{
  "id": "6134dfaac19f764fda03d84abac8d89d3e44c7d8882b0d4e5129e1258c41645a",
  "url": "https://osv.dev/vulnerability/CVE-2020-26241",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-26241",
    "summary": "Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth before version 1.9.17 which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth's pre-compiled dataCopy (at 0x00...04) contract did a shallow copy on invocation. An attacker could deploy a contract that writes X to an EVM memory region R, then calls 0x00..04 with R as an argument, then overwrites R to Y, and finally invokes the RETURNDATACOPY opcode. When this contract is invoked, a consensus-compliant node would push X on the EVM stack, whereas Geth would push Y. This is fixed in version 1.9.17.",
    "evidence": "osv:CVE-2020-26241",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-26241",
      "aliases": [
        "CVE-2020-26241",
        "GHSA-69v6-xc2j-r2jf",
        "GO-2022-0771"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ethereum/go-ethereum",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "748f22c192d24082723f935afd0b0b63e7fd50f4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.9.17"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.16",
            "v1.9.15",
            "v1.9.14",
            "v1.9.13",
            "v1.9.12",
            "v1.9.11",
            "v1.9.10",
            "v1.9.9",
            "v1.9.8",
            "v1.9.7",
            "v1.9.6",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.21",
            "v1.8.20",
            "v1.8.19",
            "v1.8.18",
            "v1.8.17",
            "v1.8.16",
            "v1.8.15",
            "v1.8.14",
            "v1.8.13",
            "v1.8.12",
            "v1.8.11",
            "v1.8.10",
            "v1.8.9",
            "v1.8.8",
            "v1.8.7",
            "v1.8.6",
            "v1.8.5",
            "v1.8.4",
            "v1.8.3",
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.3",
            "v1.7.2",
            "v1.7.1",
            "v1.7.0",
            "v1.6.7",
            "v1.6.6",
            "v1.6.5",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6.0",
            "v1.5.9",
            "v1.5.8",
            "v1.5.7",
            "v1.5.6",
            "v1.5.5",
            "v1.5.4",
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.0.1",
            "v0.9.38",
            "v0.9.36",
            "v0.9.34-1",
            "v0.9.34",
            "v0.9.32",
            "v0.9.30",
            "v0.9.28",
            "v0.9.26",
            "v0.9.25",
            "v0.9.24",
            "0.9.23",
            "v0.9.23",
            "v0.9.22",
            "v0.9.21",
            "v0.9.20",
            "v0.9.18",
            "v0.9.17",
            "0.9.16",
            "v0.8.4",
            "0.5.19",
            "0.5.18",
            "0.5.17",
            "0.5.16",
            "0.5.15",
            "0.5.14",
            "0.5.13",
            "poc5-rc12",
            "poc5-rc11",
            "2",
            "poc5-rc10",
            "poc5-rc9",
            "poc5-rc8",
            "poc5-rc7",
            "poc5-rc6",
            "poc5-rc4",
            "poc5-rc3",
            "poc5-rc2",
            "poc5-rc1",
            "0.3.1",
            "0.3.0",
            "0.2.2",
            "poc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26241.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:56.322092435Z",
      "provider": "osv",
      "references": [
        "https://blog.ethereum.org/2020/11/12/geth_security_release/",
        "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-26241",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384063,
  "published_at": "2020-11-25T02:15:11.047+00:00"
}