Vulnerability-Lookup

mal-2026-14590

Vulnerability from ossf_malicious_packages

Published

2026-08-28 10:01

Modified

2026-08-28 10:01

Summary

Malicious code in yamlformatter-utils (PyPI)

Details

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

Source: kam193 (ef2cbf7d7c360d11860ea9383a1ed84b491e75361f994359fd97284a5d25cdc2)

During import, the package collects sensitive information and exfiltrates it using DNS queries.

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

Campaign: 2026-08-ekx-report-utils

Reasons (based on the campaign):

targetted-attack
exfiltration-generic
exfiltration-credentials

Credits

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

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "yamlformatter-utils"
      },
      "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/2026-08-ekx-report-utils/yamlformatter-utils",
        "import_time": "2026-08-28T10:38:59.567163801Z",
        "modified_time": "2026-08-28T10:01:50.203858Z",
        "sha256": "ef2cbf7d7c360d11860ea9383a1ed84b491e75361f994359fd97284a5d25cdc2",
        "source": "kam193",
        "versions": [
          "1.0.0"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: kam193 (ef2cbf7d7c360d11860ea9383a1ed84b491e75361f994359fd97284a5d25cdc2)\nDuring import, the package collects sensitive information and exfiltrates it using DNS queries.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-08-ekx-report-utils\n\n\nReasons (based on the campaign):\n\n\n - targetted-attack\n\n\n - exfiltration-generic\n\n\n - exfiltration-credentials\n",
  "id": "MAL-2026-14590",
  "modified": "2026-08-28T10:01:50Z",
  "published": "2026-08-28T10:01:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://bad-packages.kam193.eu/pypi/package/yamlformatter-utils"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in yamlformatter-utils (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

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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