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CVE-2026-31900 PUBLISHED CVSS 8.699999809265137 HIGH

Black is the uncompromising Python code formatter. 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. Version 26.3.0 fixes this vulnerability.

EPSS 0.18% · 39.9th percentile

Risk Scores

CVSS v4.0
8.699999809265137
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
EPSS Score
0.18%
39.9th percentile

Affected Products

VendorProductVersions
psfblack0, 0, 0
pythonblack0, 0, 0
psfblack< 26.3.0, < 26.3.0, < 26.3.0

Timeline

References

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