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resolvedcritical

Malicious code in yfniance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfniance, which installed malicious browser extensions 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
  • yfniancePyPI package

An attacker distributed over 900 malicious packages via the Python Package Index (PyPI), with yfniance being one of the identified packages. The malicious code installed browser extensions on infected systems with the capability to intercept and manipulate clipboard contents and replace cryptocurrency wallet addresses, enabling theft of cryptocurrency transactions.\n\nThe attack was identified and documented by Checkmarx, with credit to the OpenSSF's malicious-packages repository for tracking and cataloging the incident. The malicious packages were distributed through the official PyPI repository, making them accessible to any Python developer using standard package installation tools.\n\nThis represents a significant supply chain attack targeting cryptocurrency users and developers, leveraging the trust placed in the PyPI ecosystem to distribute malware at scale.

Indicators of compromise

Packages
  • yfniance

Remediation

  • Immediately uninstall yfniance and any other packages from the 900+ malicious package list from affected systems
  • Audit pip package installation history to identify if any malicious packages were installed
  • Remove any suspicious browser extensions, particularly those installed around the time of package installation
  • Reset cryptocurrency wallet addresses and review transaction history for unauthorized transfers
  • Update all cryptocurrency wallet software and enable additional security measures such as hardware wallet usage
  • Review and strengthen Python package management practices, including using dependency pinning and verification of package sources

Sources

  1. GitHub Advisory GHSA-frrx-r6wq-6pp2 · GitHub Advisory Database

Cite this entry

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

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