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resolvedcritical

Malicious code in yyfinance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yyfinance, 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
  • yyfinanceMalicious package distributed via PyPI

A large-scale malicious package campaign distributed over 900 compromised packages through the Python Package Index (PyPI). The yyfinance package was among those affected by this attack.\n\nThe malicious code installed a browser extension that performed clipboard manipulation and cryptocurrency wallet address replacement attacks. This technique targets users who copy and paste wallet addresses, replacing them with attacker-controlled addresses to redirect cryptocurrency transactions.\n\nThe attack was identified and documented by Checkmarx and credited to the OpenSSF's malicious-packages repository. The incident represents a significant supply chain compromise affecting the Python ecosystem.

Indicators of compromise

Packages
  • yyfinance

Remediation

  • Remove or uninstall the yyfinance package immediately if installed
  • Scan systems for the malicious browser extension and remove it
  • Review browser extensions for any suspicious or unfamiliar additions
  • Check cryptocurrency wallet addresses in clipboard history for signs of manipulation
  • Update to a clean version of any legitimate package from a trusted source
  • Monitor for unauthorized cryptocurrency transactions
  • Consider using hardware wallets or address verification mechanisms to prevent clipboard replacement attacks

Sources

  1. GitHub Advisory GHSA-7rhm-vjwr-qmrp · GitHub Advisory Database

Cite this entry

"Malicious code in yyfinance (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yyfinance-pypi-129884

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