black: Black is the uncompromising Python code formatter
CVE-2026-31900 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-31900, released March 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| black · Debian 14 | 26.3.1-1 | DEBIAN-CVE-2026-31900 | Mar 11, 2026 |
| python-black · opensuse-leap 16.0 | 25.1.0-160000.3.1 | OPENSUSE-SU-2026:20417-1 | Mar 24, 2026 |
| python-black · sles 16.0 | 25.1.0-160000.3.1 | SUSE-SU-2026:20928-1 | Mar 24, 2026 |
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