GHSA-v53h-f6m7-xcgm

Source

https://github.com/advisories/GHSA-v53h-f6m7-xcgm

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-v53h-f6m7-xcgm/GHSA-v53h-f6m7-xcgm.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-v53h-f6m7-xcgm

Aliases

CVE-2026-31900

Published

2026-03-07T02:32:27Z

Modified

2026-03-13T11:31:04.330564Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Black's vulnerable version parsing leads to RCE in GitHub Action

Details

Impact

Black provides a GitHub action for formatting code. This action supports an option, use_pyproject: true, for reading the version of Black to use from the repository pyproject.toml. A malicious pull request could edit pyproject.toml to use a direct URL reference to a malicious repository. This could lead to arbitrary code execution in the context of the GitHub Action. Attackers could then gain access to secrets or permissions available in the context of the action.

Patches

Version 26.3.0 fixes this vulnerability by tightening the validation of the version field. Users who use the GitHub Action as psf/black@stable will automatically pick up this update.

Workarounds

Do not use the use_pyproject: true option in the psf/black GitHub Action.

Database specific

{
    "nvd_published_at": "2026-03-11T20:16:15Z",
    "severity": "HIGH",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-20"
    ],
    "github_reviewed_at": "2026-03-07T02:32:27Z"
}

References

Affected packages

GitHub Actions / psf/black

Package

Name: psf/black

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

26.3.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-v53h-f6m7-xcgm/GHSA-v53h-f6m7-xcgm.json"