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8.7 High

CVE-2026-31900 Black is the uncompromising Python code formatter

Description

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.

Affected products and versions

Product Affected versions Fixed in
black 26.3 earliest → < 26.3.0 26.3.0

References

Timeline

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Other CVEs of black

The 3 CVEs of black →
CVE-2026-114134 Black: GitHub Action installs unvalidated required-version from pyproject.toml 8.7 High CVE-2026-32274 Black is the uncompromising Python code formatter 8.7 High
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