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supplychainattack.orgSupply chain attack incident catalog
resolvedcritical

Malicious code in ypj (PyPI)

Malicious code was discovered in the ypj package on PyPI. The package contained intentional malicious functionality and has been flagged by the OpenSSF malicious packages database.

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Disclosed
Last updated
Blast radius
Unknown scope; depends on adoption of affected versions
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • ypjPyPI package

The ypj 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 software supply chain incidents.\n\nThe malicious package was published to the Python Package Index (PyPI), making it available for installation by developers. The OpenSSF assigned this incident the identifier MAL-2025-4274 in their tracking system.\n\nUsers who installed affected versions of ypj should remove the package and audit their systems for any unauthorized activity or data exfiltration that may have occurred.

Indicators of compromise

Packages
  • ypj

Remediation

  • Remove the ypj package from all affected systems immediately
  • Audit systems that installed ypj for signs of compromise or unauthorized access
  • Review package dependencies to ensure no other malicious packages were installed
  • Monitor for any suspicious network activity or data exfiltration from affected systems
  • Use a package manager with security scanning capabilities to detect similar threats

Sources

  1. GitHub Advisory GHSA-xpfh-v2mw-vvpc · GitHub Advisory Database

Cite this entry

"Malicious code in ypj (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-ypj-pypi-l96h4e

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