BREW-PYTHON-LSP-SERVER-C… (PYSEC-2026-2120)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:29 – Updated: 2026-09-17 20:04 – Source website
VLAI
Details

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.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "black",
        "resource_purl": "pkg:pypi/black@26.5.1",
        "upstream_fixed_in": "26.3.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "python-lsp-server",
        "purl": "pkg:brew/python-lsp-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.11.0"
            },
            {
              "fixed": "1.14.0_1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/black@26.5.1",
        "name": "black",
        "resource": "black",
        "strategy": "registry",
        "subject_version": "26.5.1"
      }
    ]
  },
  "details": "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.",
  "id": "BREW-python-lsp-server-CVE-2026-31900",
  "modified": "2026-09-17T20:04:46Z",
  "published": "2026-08-13T17:29:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/psf/black/security/advisories/GHSA-v53h-f6m7-xcgm"
    },
    {
      "type": "FIX",
      "url": "https://github.com/psf/black/commit/0a2560b981364dde4c8cf8ce9d164c40669a8611"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "PYSEC-2026-2120",
    "CVE-2026-31900",
    "GHSA-v53h-f6m7-xcgm"
  ]
}



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