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resolvedcritical

Malicious code in yfiance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfiance, which installed malicious browser extensions designed to manipulate clipboard contents 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
  • yfiancePyPI package

A large-scale malicious package campaign distributed over 900 compromised packages via PyPI. The yfiance package was among those affected and contained 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 modify cryptocurrency transactions by replacing legitimate wallet addresses with attacker-controlled addresses.\n\nThe incident was identified and documented by the OpenSSF's malicious-packages repository (MAL-2023-2447). The attack targeted users installing these packages from PyPI, with the malicious extension executing in the browser context of affected systems.

Indicators of compromise

Packages
  • yfiance

Remediation

  • Remove the yfiance package and any other packages from the identified malicious campaign
  • Audit system for installed browser extensions and remove any suspicious or unknown extensions
  • Review recent cryptocurrency transactions for signs of address manipulation
  • Update to clean versions of legitimate packages if available
  • Monitor clipboard activity and cryptocurrency wallet addresses for unauthorized changes
  • Consider using hardware wallets or air-gapped systems for sensitive cryptocurrency operations

Sources

  1. GitHub Advisory GHSA-7r3q-wvr8-9xp2 · GitHub Advisory Database

Cite this entry

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

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