CVE-2026-114134 (GCVE-0-2026-114134)

Vulnerability from cvelistv5 – Published: 2026-11-05 20:22 – Updated: 2026-11-09 17:42
VLAI
Title
Black: GitHub Action installs unvalidated required-version from pyproject.toml
Summary
Black is the uncompromising Python code formatter. Prior to 26.10.1, the Black GitHub Action with use_pyproject: true accepts tool.black.required-version from pyproject.toml without validating that it is a released Black version specifier. An attacker who can submit a pull request can change that field to a direct reference to attacker-controlled code, causing the workflow to install and execute the code in the victim repository's GitHub Actions context. This issue is fixed in version 26.10.1.
Severity
8.7 (High)
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 17:37 UTC
CWE
  • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
psf black Affected: < 26.10.1
Create a notification for this product.
Show details on NVD website
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