CVE-2026-118762 (GCVE-0-2026-118762)

Vulnerability from cvelistv5 – Published: 2026-10-29 16:50 – Updated: 2026-10-29 16:50
VLAI
Title
Monkeytype: fork PR can execute code with elevated GITHUB_TOKEN
Summary
Monkeytype is a minimalistic and customizable typing test. Prior to 26.43.0, the .github/workflows/fix-formatting.yml workflow runs on pull_request_target with repository write permissions, checks out a fork pull request, installs dependencies from the fork's package.json, and invokes the fork-controlled oxfmt binary. Because actions/checkout persists the elevated GITHUB_TOKEN in Git configuration until after untrusted code executes, an external contributor whose pull request receives the format label can run arbitrary code, read or exfiltrate the token, and push repository content or modify pull requests and issues. The issue affects the repository CI workflow, not the Monkeytype application or user data. This issue is fixed in version 26.43.0.
Severity
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
monkeytypegame monkeytype Affected: < 26.43.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "monkeytype",
          "vendor": "monkeytypegame",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.43.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Monkeytype is a minimalistic and customizable typing test. Prior to 26.43.0, the .github/workflows/fix-formatting.yml workflow runs on pull_request_target with repository write permissions, checks out a fork pull request, installs dependencies from the fork\u0027s package.json, and invokes the fork-controlled oxfmt binary. Because actions/checkout persists the elevated GITHUB_TOKEN in Git configuration until after untrusted code executes, an external contributor whose pull request receives the format label can run arbitrary code, read or exfiltrate the token, and push repository content or modify pull requests and issues. The issue affects the repository CI workflow, not the Monkeytype application or user data. This issue is fixed in version 26.43.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-29T16:50:44.341Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8"
        },
        {
          "name": "https://github.com/monkeytypegame/monkeytype/commit/592ce1becb9b6824badc14a803bcd9268cbea382",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/monkeytypegame/monkeytype/commit/592ce1becb9b6824badc14a803bcd9268cbea382"
        },
        {
          "name": "https://github.com/monkeytypegame/monkeytype/releases/tag/v26.43.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/monkeytypegame/monkeytype/releases/tag/v26.43.0"
        }
      ],
      "source": {
        "advisory": "GHSA-47v3-j88w-92f8",
        "discovery": "UNKNOWN"
      },
      "title": "Monkeytype: fork PR can execute code with elevated GITHUB_TOKEN"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-118762",
    "datePublished": "2026-10-29T16:50:44.341Z",
    "dateReserved": "2026-10-28T19:20:05.017Z",
    "dateUpdated": "2026-10-29T16:50:44.341Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-118762",
      "date": "2026-10-31",
      "epss": "0.0032",
      "percentile": "0.25016"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "monkeytype",
                "vendor": "monkeytypegame",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 26.43.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Monkeytype is a minimalistic and customizable typing test. Prior to 26.43.0, the .github/workflows/fix-formatting.yml workflow runs on pull_request_target with repository write permissions, checks out a fork pull request, installs dependencies from the fork\u0027s package.json, and invokes the fork-controlled oxfmt binary. Because actions/checkout persists the elevated GITHUB_TOKEN in Git configuration until after untrusted code executes, an external contributor whose pull request receives the format label can run arbitrary code, read or exfiltrate the token, and push repository content or modify pull requests and issues. The issue affects the repository CI workflow, not the Monkeytype application or user data. This issue is fixed in version 26.43.0."
          }
        ],
        "id": "CVE-2026-118762",
        "lastModified": "2026-10-29T17:18:07.200",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.8,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-29T17:18:07.070",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/monkeytypegame/monkeytype/commit/592ce1becb9b6824badc14a803bcd9268cbea382"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/monkeytypegame/monkeytype/releases/tag/v26.43.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-829"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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