Python
CVE-2026-31900
Lifecycle Timeline
2Blast Radius
ecosystem impact- 1 pypi packages depend on black (1 direct, 0 indirect)
Ecosystem-wide dependent count for version 26.3.0.
DescriptionCVE.org
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.
AnalysisAI
Black is the uncompromising Python code formatter. Black provides a GitHub action for formatting code.
Technical ContextAI
Classified as CWE-20 (Improper Input Validation). 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 con
Affected ProductsAI
Black is the uncompromising Python code formatter
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-20 – Improper Input Validation
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External POC / Exploit Code
Leaving vuln.today