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supplychainattack.orgSupply chain attack incident catalog
resolvedcritical

Malicious code in yfinnace (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfinnace, which infected local browsers with a malicious extension designed to manipulate clipboard and replace cryptocurrency wallet addresses.

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Disclosed
Last updated
Blast radius
900+ malicious packages distributed via PyPI
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • yfinnacePyPI package containing malicious code

An attacker distributed over 900 malicious packages via PyPI as part of a coordinated campaign. The yfinnace package was among those compromised with malicious code.\n\nThe malicious packages installed browser extensions that performed clipboard manipulation and cryptocurrency wallet address replacement attacks. This allowed attackers to intercept and redirect cryptocurrency transactions by replacing legitimate wallet addresses with attacker-controlled addresses.\n\nThe incident was identified and documented by Checkmarx and credited to the OpenSSF malicious-packages repository. The attack demonstrates the risk of supply chain compromise through public package repositories.

Indicators of compromise

Packages
  • yfinnace

Remediation

  • Remove or uninstall the yfinnace package immediately
  • Audit systems for the presence of malicious browser extensions
  • Review browser extension permissions and remove any suspicious extensions
  • Check cryptocurrency wallet addresses in recent transactions for signs of manipulation
  • Monitor PyPI for similar malicious package distributions
  • Use dependency scanning tools to detect malicious packages in development environments

Sources

  1. GitHub Advisory GHSA-89mv-vj77-vxmv · GitHub Advisory Database

Cite this entry

"Malicious code in yfinnace (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfinnace-pypi-5sao2w

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