CVE-2026-114134

    Dashboard / Vulnerabilities / CVE-2026-114134

    CVE-2026-114134

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Black: GitHub Action installs unvalidated required-version from pyproject.toml

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114134.json, https://github.com/psf/black/security/advisories/GHSA-cg8m-r9f2-5wm2, https://nvd.nist.gov/vuln/detail/CVE-2026-114134, https://github.com/psf/black/commit/ac1f71563aeccf73cf13ece00f231d9d6c66a514, https://github.com/psf/black/pull/5510

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -258e7dbf348bc23cb70b8cdf693481c04634ebcc

    Affected versions

    26.10.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-114134 | CVE-DB