GHSA-v53h-f6m7-xcgm

Suggest an improvement
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.test.osv.dev/v1/vulns/GHSA-v53h-f6m7-xcgm
Aliases
Published
2026-03-07T02:32:27Z
Modified
2026-09-15T06:34:31Z
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 
{
    "cwe_ids": [
        "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-07T02:32:27Z",
    "nvd_published_at": "2026-03-11T20:16:15Z",
    "severity": "HIGH"
}
References

Affected packages

GitHub Actions / psf/black

Package

Name
psf/black

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
26.3.0
Type
GIT
Repo
https://github.com/psf/black
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
35ea67920b7f6ac8e09be1c47278752b1e827f76

Affected versions

18.*
18.3a0
18.3a1
18.3a2
18.3a3
18.3a4
18.4a0
18.4a1
18.4a2
18.4a3
18.4a4
18.5b0
18.5b1
18.6b0
18.6b1
18.6b2
18.6b3
18.6b4
18.9b0
19.*
19.10b0
19.3b0
20.*
20.8b0
20.8b1
21.*
21.10b0
21.11b0
21.11b1
21.12b0
21.4b0
21.4b1
21.4b2
21.5b0
21.5b1
21.5b2
21.6b0
21.7b0
21.8b0
21.9b0
22.*
22.1.0
22.10.0
22.12.0
22.3.0
22.6.0
22.8.0
23.*
23.1.0
23.10.0
23.10.1
23.11.0
23.12.0
23.12.1
23.3.0
23.7.0
23.9.0
23.9.1
24.*
24.1.0
24.1.1
24.10.0
24.2.0
24.3.0
24.4.0
24.4.1
24.4.2
24.8.0
25.*
25.1.0
25.11.0
25.12.0
25.9.0
26.*
26.1.0

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"