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resolvedcritical

Malicious code in yfnance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfnance, 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
  • yfnancePyPI package

A large-scale malicious package campaign distributed over 900 compromised packages via the Python Package Index (PyPI). The yfnance package was among those affected by this attack.\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 when users copied and pasted them.\n\nThe incident was identified and documented by the OpenSSF's malicious-packages repository, with the attack tracked under identifier MAL-2023-2461. The campaign represents a significant supply chain compromise affecting the Python ecosystem.

Indicators of compromise

Packages
  • yfnance

Remediation

  • Remove yfnance and any other suspicious packages from affected systems
  • Audit system for installed browser extensions, particularly those installed without explicit user action
  • Review cryptocurrency transaction history for any suspicious wallet address changes
  • Update to clean versions of legitimate packages if available
  • Monitor for signs of clipboard manipulation or unauthorized browser extensions
  • Consider using package verification tools and dependency scanning to detect malicious packages before installation

Sources

  1. GitHub Advisory GHSA-7mqx-gg2w-2rjm · GitHub Advisory Database

Cite this entry

"Malicious code in yfnance (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfnance-pypi-tpvq8y

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