GHSA-RRXM-2PVV-M66X

Vulnerability from github – Published: 2025-12-30 15:18 – Updated: 2025-12-30 15:18
VLAI
Summary
Picklescan is vulnerable to RCE via missing detection when calling numpy.f2py.crackfortran.getlincoef
Details

Summary

Picklescan uses the numpy.f2py.crackfortran.getlincoef function (a NumPy F2PY helper) to execute arbitrary Python code during unpickling.

Details

Picklescan fails to detect a malicious pickle that uses the gadget numpy.f2py.crackfortran.getlincoef in __reduce__, allowing arbitrary command execution when the pickle is loaded. A crafted object returns this function plus attacker‑controlled arguments; the scan reports the file as safe, but pickle.load() triggers execution.

PoC

class PoC:
    def __reduce__(self):
        from numpy.f2py.crackfortran import getlincoef
        return getlincoef, ("__import__('os').system('whoami')", None)

Impact

  • Arbitrary code execution on the victim machine once they load the “scanned as safe” pickle / model file.
  • Affects any workflow relying on Picklescan to vet untrusted pickle / PyTorch artifacts.
  • Enables supply‑chain poisoning of shared model files.

Credits

Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "picklescan"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.33"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-502",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-30T15:18:16Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nPicklescan uses the `numpy.f2py.crackfortran.getlincoef` function (a NumPy F2PY helper) to execute arbitrary Python code during unpickling.\n\n### Details\n\nPicklescan fails to detect a malicious pickle that uses the gadget `numpy.f2py.crackfortran.getlincoef` in `__reduce__`, allowing arbitrary command execution when the pickle is loaded. A crafted object returns this function plus attacker\u2011controlled arguments; the scan reports the file as safe, but pickle.load() triggers execution.\n\n### PoC\n```python\nclass PoC:\n    def __reduce__(self):\n        from numpy.f2py.crackfortran import getlincoef\n        return getlincoef, (\"__import__(\u0027os\u0027).system(\u0027whoami\u0027)\", None)\n```\n\n### Impact\n\n- Arbitrary code execution on the victim machine once they load the \u201cscanned as safe\u201d pickle / model file.\n- Affects any workflow relying on Picklescan to vet untrusted pickle / PyTorch artifacts.\n- Enables supply\u2011chain poisoning of shared model files.\n\n### Credits\n- [ac0d3r](https://github.com/ac0d3r)\n- [Tong Liu](https://lyutoon.github.io), Institute of information engineering, CAS",
  "id": "GHSA-rrxm-2pvv-m66x",
  "modified": "2025-12-30T15:18:16Z",
  "published": "2025-12-30T15:18:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mmaitre314/picklescan/security/advisories/GHSA-rrxm-2pvv-m66x"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mmaitre314/picklescan/pull/53"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mmaitre314/picklescan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mmaitre314/picklescan/releases/tag/v0.0.33"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Picklescan is vulnerable to RCE via missing detection when calling numpy.f2py.crackfortran.getlincoef"
}



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