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Vulnerability details

CVE-2026-118762

monkeytypegame monkeytype

Monkeytype: fork PR can execute code with elevated GITHUB_TOKEN

CVSS 3.1
9.3Critical

Official description

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.

CVSS scores

ScoreVersionSourceVector
9.3Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
monkeytypegame monkeytype < 26.43.0 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-10-29
Last updated
2026-11-04
State
Published
Assigner (CNA)
GitHub_M
Kolun priority
20 · Low

Exploit prediction (EPSS)

0.32%
Probability of exploitation in 30 days
25.1%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-829
    Inclusion of Functionality from Untrusted Control Sphere