# CVE-2026-118762: Monkeytype: fork PR can execute code with elevated GITHUB_TOKEN

Status: published. Published: 2026-10-29. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- monkeytypegame / monkeytype: < 26.43.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 9.3 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.32% as of 2026-11-03; percentile 25.04%

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-829

## Exploit evidence

- exploit: https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8 (ADP: CISA-ADP)

## References

- https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/monkeytypegame/monkeytype/commit/592ce1becb9b6824badc14a803bcd9268cbea382 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/monkeytypegame/monkeytype/releases/tag/v26.43.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-47v3-j88w-92f8 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-118762; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118762; retrieved 2026-11-04; source updated Not reported

Revision: 6a78d5441f45dee3f2b20046f271f34308328840ab5ea87bd695172f0a655ca9

Canonical: https://y2.dev/cve/CVE-2026-118762

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