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resolvedcritical

Malicious code in adv2099m4 (PyPI)

Malicious code was discovered in the adv2099m4 package on PyPI. The package was identified and cataloged by the OpenSSF malicious-packages project.

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Disclosed
Last updated
Blast radius
Unknown; depends on adoption of adv2099m4 package
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • adv2099m4PyPI package containing malicious code

The adv2099m4 package on PyPI was found to contain malicious code. This incident was identified and documented by the OpenSSF's malicious-packages project, which maintains a catalog of known malicious packages across package ecosystems.\n\nThe package was published on PyPI and could have been installed by users who explicitly depended on it. The malicious nature of the package was detected and reported through the OpenSSF's coordinated disclosure process.\n\nThis is a confirmed supply chain attack via a malicious package published to a public package repository.

Indicators of compromise

Packages
  • adv2099m4

Remediation

  • Remove adv2099m4 from all dependencies and lock files
  • Audit systems that may have installed adv2099m4 for signs of compromise
  • Review pip install logs to identify affected installations
  • Update to a safe version or alternative package if adv2099m4 was a required dependency
  • Monitor for similar malicious packages using OpenSSF malicious-packages database

Sources

  1. GitHub Advisory GHSA-8q23-8xf5-jwwf · GitHub Advisory Database

Cite this entry

"Malicious code in adv2099m4 (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-adv2099m4-pypi-1y03cg

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