Vulnerability-Lookup

mal-2026-16407

Vulnerability from ossf_malicious_packages

Published

2026-09-22 18:41

Modified

2026-09-22 18:41

Summary

Malicious code in poly-check-b (PyPI)

Details

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

Source: kam193 (0e03276b0825e5aa683a1edd8c9a7f9947888cd03cde8c5351895a0fa3c2fba6)

During installation, the package attempts to silently execute code. In analyzed versions, the payload file was missing.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-09-snap-queue

Reasons (based on the campaign):

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

Credits

Kamil Mańkowski (kam193) github.com/kam193 bad-packages.kam193.eu/

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "poly-check-b"
      },
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "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/2026-09-snap-queue/poly-check-b",
        "import_time": "2026-09-22T18:44:15.285019518Z",
        "modified_time": "2026-09-22T18:41:04.755393Z",
        "sha256": "0e03276b0825e5aa683a1edd8c9a7f9947888cd03cde8c5351895a0fa3c2fba6",
        "source": "kam193",
        "versions": [
          "1.0.0"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: kam193 (0e03276b0825e5aa683a1edd8c9a7f9947888cd03cde8c5351895a0fa3c2fba6)\nDuring installation, the package attempts to silently execute code. In analyzed versions, the payload file was missing.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-09-snap-queue\n\n\nReasons (based on the campaign):\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n",
  "id": "MAL-2026-16407",
  "modified": "2026-09-22T18:41:04Z",
  "published": "2026-09-22T18:41:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://bad-packages.kam193.eu/pypi/package/poly-check-b"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in poly-check-b (PyPI)"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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