MAL-2026-1
Vulnerability from ossf_malicious_packages
Published
2026-01-01 11:16
Modified
2026-01-01 11:16
Summary
Malicious code in sfnt2woff-zopfli (PyPI)
Details

-= Per source details. Do not edit below this line.=-

Source: kam193 (f372716a5cf92b41a37e0d7a83e287a41fcaca77b3cf9a324554c20a86635d8a)

Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.


Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: GENERIC-standard-pypi-install-pentest

Reasons (based on the campaign):

  • The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

  • The package overrides the install command in setup.py to execute malicious code during installation.

Credits

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sfnt2woff-zopfli"
      },
      "versions": [
        "0.0.0",
        "17.0.0"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "https://github.com/kam193",
        "https://bad-packages.kam193.eu/"
      ],
      "name": "Kamil Ma\u0144kowski (kam193)",
      "type": "REPORTER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "pypi/GENERIC-standard-pypi-install-pentest/sfnt2woff-zopfli",
        "import_time": "2026-01-01T12:11:42.453176989Z",
        "modified_time": "2026-01-01T11:16:31.574553Z",
        "sha256": "f372716a5cf92b41a37e0d7a83e287a41fcaca77b3cf9a324554c20a86635d8a",
        "source": "kam193",
        "versions": [
          "0.0.0",
          "17.0.0"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: kam193 (f372716a5cf92b41a37e0d7a83e287a41fcaca77b3cf9a324554c20a86635d8a)\nInstalling the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.\n\n\n---\n\nCategory: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research \u0026 co, with clearly low-harm possibilities.\n\n\nCampaign: GENERIC-standard-pypi-install-pentest\n\n\nReasons (based on the campaign):\n\n\n - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n",
  "id": "MAL-2026-1",
  "modified": "2026-01-01T11:16:31Z",
  "published": "2026-01-01T11:16:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://bad-packages.kam193.eu/pypi/package/sfnt2woff-zopfli"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in sfnt2woff-zopfli (PyPI)"
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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