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resolvedcritical

Malicious code in ytest-cov (PyPI)

Malicious code was discovered in the ytest-cov package on PyPI. The package contained malicious payload that could compromise systems of users who installed it.

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Disclosed
Last updated
Blast radius
PyPI package repository; all users who installed affected versions of ytest-cov
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • ytest-covMalicious package on PyPI

The ytest-cov package on PyPI was found to contain malicious code. This incident was identified and documented by the OpenSSF's malicious-packages project.\n\nThe malicious package was hosted on the PyPI repository, making it accessible to Python developers who might install it as a dependency or directly. Any system that installed an affected version of ytest-cov would have been compromised.\n\nThis incident has been documented in the OpenSSF malicious-packages repository under identifier MAL-2025-3020, and a GitHub Security Advisory (GHSA-v289-rrvh-682g) was issued to track the vulnerability.

Indicators of compromise

Packages
  • ytest-cov

Remediation

  • Remove ytest-cov from all environments and dependency lists
  • Audit systems that may have installed ytest-cov for signs of compromise
  • Review package dependencies to ensure no reliance on ytest-cov
  • Use verified, legitimate alternatives for test coverage tools
  • Monitor PyPI for similar typosquatting or malicious package attempts

Sources

  1. GitHub Advisory GHSA-v289-rrvh-682g · GitHub Advisory Database

Cite this entry

"Malicious code in ytest-cov (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-ytest-cov-pypi-wz0iqx

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