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.
ParzivalHack Reporter
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 repositorypyproject.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
versionfield. Users who use the GitHub Action aspsf/black@stablewill automatically pick up this update.Workarounds
Do not use the
use_pyproject: trueoption in the psf/black GitHub Action.