Vulnerability-Lookup

CVE-2020-26241 (GCVE-0-2020-26241)

Vulnerability from cvelistv5 – Published: 2020-11-25 01:25 – Updated: 2024-08-04 15:56

Title

Shallow copy bug in geth

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.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-682 - Incorrect Calculation

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://blog.ethereum.org/2020/11/12/geth_securit…	x_refsource_MISC
https://github.com/ethereum/go-ethereum/security/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ethereum	go-ethereum	Affected: >= 1.9.7, < 1.9.17

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2020-26241

Vulnerability from fkie_nvd - Published: 2020-11-25 02:15 - Updated: 2026-06-17 03:07

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Summary

References

URL	Tags
security-advisories@github.com	https://blog.ethereum.org/2020/11/12/geth_security_release/	Vendor Advisory
security-advisories@github.com	https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://blog.ethereum.org/2020/11/12/geth_security_release/	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf	Third Party Advisory

Impacted products

	Vendor	Product	Version
	ethereum	go_ethereum	*

JSON

To clipboard

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    {
      "affectedData": [
        {
          "product": "go-ethereum",
          "vendor": "ethereum",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.9.7, \u003c 1.9.17"
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      "value": "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\u0027s 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."
    },
    {
      "lang": "es",
      "value": "Go Ethereum, o \"Geth\", es la implementaci\u00f3n oficial Golang del protocolo Ethereum.\u0026#xa0;Esta es una vulnerabilidad de Consensus en Geth versiones anteriores a 1.9.17 que puede ser usada para causar una divisi\u00f3n de cadena donde unos nodos vulnerables rechazan la cadena can\u00f3nica.\u0026#xa0;El contrato de copia de datos precompilado de Geth (en 0x00 ... 04) hizo una copia superficial en la invocaci\u00f3n.\u0026#xa0;Un atacante podr\u00eda implementar un contrato que escribe X en una regi\u00f3n de memoria R de EVM, luego llama a 0x00..04 con R como argumento, luego sobrescribe R en Y y finalmente invoca el c\u00f3digo de operaci\u00f3n RETURNDATACOPY.\u0026#xa0;Cuando este contrato es invocado, un nodo consensus-compliant empujar\u00eda X en la pila de EVM, mientras que Geth empujar\u00eda Y. Esto es corregido en la versi\u00f3n 1.9.17"
    }
  ],
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    },
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}

GHSA-69V6-XC2J-R2JF

Vulnerability from github – Published: 2021-06-29 21:13 – Updated: 2025-01-30 14:37

Summary

Shallow copy bug in geth

Details

Impact

This is a Consensus vulnerability, 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,
calls 0x00..04 with R as an argument,
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.

Patches

No standalone patches have been made.

Workarounds

Upgrade to 1.9.17 or higher.

References

https://blog.ethereum.org/2020/11/12/geth_security_release/

For more information

If you have any questions or comments about this advisory: * Open an issue in go-ethereum * Email us at security@ethereum.org

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/ethereum/go-ethereum"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.9.7"
            },
            {
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            }
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-26241"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-682"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-21T21:51:49Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nThis is a Consensus vulnerability, which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. \n\nGeth\u2019s pre-compiled `dataCopy` (at `0x00...04`) contract did a shallow copy on invocation. An attacker could deploy a contract that \n\n- writes `X` to an EVM memory region `R`,\n- calls `0x00..04` with `R` as an argument,\n- overwrites `R` to `Y`,\n- and finally invokes the `RETURNDATACOPY` opcode.\n\nWhen this contract is invoked, a consensus-compliant node would push `X` on the EVM stack, whereas Geth would push `Y`.\n\n\n### Patches\n\nNo standalone patches have been made. \n\n### Workarounds\n\nUpgrade to `1.9.17` or higher.\n\n### References\n\nhttps://blog.ethereum.org/2020/11/12/geth_security_release/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)\n",
  "id": "GHSA-69v6-xc2j-r2jf",
  "modified": "2025-01-30T14:37:49Z",
  "published": "2021-06-29T21:13:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26241"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ethereum/go-ethereum/commit/295693759e5ded05fec0b2fb39359965b60da785"
    },
    {
      "type": "WEB",
      "url": "https://blog.ethereum.org/2020/11/12/geth_security_release"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ethereum/go-ethereum"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Shallow copy bug in geth"
}

GSD-2020-26241

Vulnerability from gsd - Updated: 2023-12-13 01:22

Details

Aliases

CVE-2020-26241

Aliases

CVE-2020-26241

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2020-26241",
    "description": "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\u0027s 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.",
    "id": "GSD-2020-26241"
  },
  "gsd": {
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      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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      "details": "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\u0027s 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.",
      "id": "GSD-2020-26241",
      "modified": "2023-12-13T01:22:08.709513Z",
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    }
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            "value": "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\u0027s 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."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-682: Incorrect Calculation"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://blog.ethereum.org/2020/11/12/geth_security_release/",
            "refsource": "MISC",
            "url": "https://blog.ethereum.org/2020/11/12/geth_security_release/"
          },
          {
            "name": "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf",
            "refsource": "CONFIRM",
            "url": "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-69v6-xc2j-r2jf",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003cv1.9.17",
          "affected_versions": "All versions before 1.9.17",
          "cvss_v2": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
          "cwe_ids": [
            "CWE-1035",
            "CWE-682",
            "CWE-937"
          ],
          "date": "2020-12-03",
          "description": "Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth\u0027s pre-compiled dataCopy (at `0x00..0x04`) 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..0x04` 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 ",
          "fixed_versions": [
            "v1.9.17"
          ],
          "identifier": "CVE-2020-26241",
          "identifiers": [
            "CVE-2020-26241",
            "GHSA-69v6-xc2j-r2jf"
          ],
          "not_impacted": "All versions starting from 1.9.17",
          "package_slug": "go/github.com/ethereum/go-ethereum",
          "pubdate": "2020-11-25",
          "solution": "Upgrade to version 1.9.17 or above.",
          "title": "Incorrect Calculation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-26241",
            "https://blog.ethereum.org/2020/11/12/geth_security_release/"
          ],
          "uuid": "7e6f1574-e262-43e0-ba6e-b08c571f0b16",
          "versions": [
            {
              "commit": {
                "sha": "748f22c192d24082723f935afd0b0b63e7fd50f4",
                "tags": [
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                "timestamp": "20200720125642"
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            }
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          "description": "Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth\u0027s pre-compiled dataCopy (at `0x00..0x04`) 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..0x04` 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 ",
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          ],
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          "package_slug": "go/github.com/ethereum/go-ethereum/cmd/evm",
          "pubdate": "2020-11-25",
          "solution": "Upgrade to version 1.9.17 or above.",
          "title": "Incorrect Calculation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-26241",
            "https://blog.ethereum.org/2020/11/12/geth_security_release/"
          ],
          "uuid": "45d1ae5d-cea5-4a11-9f80-5937a425461d",
          "versions": [
            {
              "commit": {
                "sha": "748f22c192d24082723f935afd0b0b63e7fd50f4",
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                ],
                "timestamp": "20200720125642"
              },
              "number": "v1.9.17"
            }
          ]
        },
        {
          "affected_range": "\u003c1.19.7",
          "affected_versions": "All versions before 1.19.7",
          "cvss_v2": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
          "cwe_ids": [
            "CWE-1035",
            "CWE-682",
            "CWE-937"
          ],
          "date": "2021-06-29",
          "description": "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\u0027s 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.",
          "fixed_versions": [
            "1.19.7"
          ],
          "identifier": "CVE-2020-26241",
          "identifiers": [
            "GHSA-69v6-xc2j-r2jf",
            "CVE-2020-26241"
          ],
          "not_impacted": "All versions starting from 1.19.7",
          "package_slug": "go/github.com/ethereum/go-ethereum/core/vm",
          "pubdate": "2021-06-29",
          "solution": "Upgrade to version 1.19.7 or above.",
          "title": "Incorrect Calculation",
          "urls": [
            "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf",
            "https://nvd.nist.gov/vuln/detail/CVE-2020-26241",
            "https://github.com/ethereum/go-ethereum/commit/295693759e5ded05fec0b2fb39359965b60da785",
            "https://github.com/advisories/GHSA-69v6-xc2j-r2jf"
          ],
          "uuid": "7dbe9922-bc4c-4519-9a4c-1ef59b969fe8"
        },
        {
          "affected_range": "\u003cv1.9.17",
          "affected_versions": "All versions before 1.9.17",
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          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
          "cwe_ids": [
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            "CWE-682",
            "CWE-937"
          ],
          "date": "2020-12-03",
          "description": "Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth\u0027s pre-compiled dataCopy (at `0x00..0x04`) 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..0x04` 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 ",
          "fixed_versions": [
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          ],
          "identifier": "CVE-2020-26241",
          "identifiers": [
            "CVE-2020-26241",
            "GHSA-69v6-xc2j-r2jf"
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          "package_slug": "go/github.com/ethereum/go-ethereum/eth",
          "pubdate": "2020-11-25",
          "solution": "Upgrade to version 1.9.17 or above.",
          "title": "Incorrect Calculation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-26241",
            "https://blog.ethereum.org/2020/11/12/geth_security_release/"
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          "uuid": "31d8cd3e-eef3-481a-b355-f76b07af6bc4",
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          ]
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
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        "nodes": [
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            "children": [],
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          },
          "exploitabilityScore": 8.0,
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            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
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          "exploitabilityScore": 2.8,
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        }
      },
      "lastModifiedDate": "2020-12-03T15:48Z",
      "publishedDate": "2020-11-25T02:15Z"
    }
  }
}

OPENSUSE-SU-2025:15424-1

Vulnerability from csaf_opensuse - Published: 2025-08-08 00:00 - Updated: 2026-09-20 21:39

Summary

govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media

Severity

Moderate

Scope

44 vulnerabilities in this advisory, including CVE-2020-26241.

CVE-2020-26241

7.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Recommended: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2020-26241 (GCVE-0-2020-26241)

FKIE_CVE-2020-26241

GHSA-69V6-XC2J-R2JF

Impact

Patches

Workarounds

References

For more information

GSD-2020-26241

OPENSUSE-SU-2025:15424-1

Tags

Sightings

Nomenclature

Related by attack behaviour