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I. Basic Information for CVE-2026-31900
Vulnerability Information

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Vulnerability Title
Black's vulnerable version parsing leads to RCE in GitHub Action
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Black 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Black是Python Software Foundation开源的一个 Python 代码格式化程序。 Black 26.3.0之前版本存在输入验证错误漏洞,该漏洞源于恶意拉取请求可配置使用恶意仓库URL,可能导致任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
psfblack < 26.3.0 -
II. Public POCs for CVE-2026-31900
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III. Intelligence Information for CVE-2026-31900
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