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brew-pdm-cve-2026-47764
Vulnerability from osv_homebrew
Published
2026-08-13 17:25
Modified
2026-09-15 10:09
Summary
pdm: Path traversal in wheel installation via overridden write_to_fs
Details

pdm is a Python package and dependency manager supporting the latest PEP standards. Versions prior to 2.27.0 are vulnerable to path traversal through write_to_fs. InstallDestination.write_to_fs() in src/pdm/installers/installers.py overrides the base class to add symlink/hardlink support but replaces the safe _path_with_destdir() (which validates via Path.resolve() + is_relative_to()) with a bare os.path.join() that performs no path validation. A malicious wheel with traversal entries can write arbitrary files. This issue has been fixed in version 2.27.0.

Severity
8.4 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "2.27.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pdm",
        "purl": "pkg:brew/pdm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/pdm-project/pdm",
        "name": "https://github.com/pdm-project/pdm",
        "strategy": "git",
        "subject_version": "2.29.1"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/pdm@2.29.1",
        "name": "pdm",
        "strategy": "registry",
        "subject_version": "2.29.1"
      },
      {
        "ecosystem": "Debian",
        "key": "Debian/pdm",
        "name": "pdm",
        "strategy": "distro"
      },
      {
        "ecosystem": "GIT",
        "key": "upstream:https://github.com/pdm-project/pdm",
        "name": "https://github.com/pdm-project/pdm",
        "strategy": "distro",
        "subject_version": "2.29.1"
      },
      {
        "ecosystem": "PyPI",
        "key": "upstream:pkg:pypi/pdm@2.29.1",
        "name": "pdm",
        "strategy": "distro",
        "subject_version": "2.29.1"
      },
      {
        "ecosystem": "Ubuntu",
        "key": "Ubuntu/pdm",
        "name": "pdm",
        "strategy": "distro"
      }
    ]
  },
  "details": "pdm is a Python package and dependency manager supporting the latest PEP standards. Versions prior to 2.27.0 are vulnerable to path traversal through write_to_fs. InstallDestination.write_to_fs() in src/pdm/installers/installers.py overrides the base class to add symlink/hardlink support but replaces the safe _path_with_destdir() (which validates via Path.resolve() + is_relative_to()) with a bare os.path.join() that performs no path validation. A malicious wheel with traversal entries can write arbitrary files. This issue has been fixed in version 2.27.0.",
  "id": "BREW-pdm-CVE-2026-47764",
  "modified": "2026-09-15T10:09:47Z",
  "published": "2026-08-13T17:25:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pdm-project/pdm/releases/tag/2.27.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47764.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pdm-project/pdm/security/advisories/GHSA-78v8-vpjp-cjqh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47764"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pdm: Path traversal in wheel installation via overridden write_to_fs",
  "upstream": [
    "CVE-2026-47764",
    "GHSA-78v8-vpjp-cjqh",
    "PYSEC-2026-2861"
  ]
}



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