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resolvedcritical

Malicious code in yfinancee (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfinancee, which installed malicious browser extensions designed to manipulate clipboard and replace cryptocurrency wallet addresses. The campaign was identified and documented by the OpenSSF malicious-packages project.

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

A large-scale malicious package distribution campaign targeted PyPI, with the attacker publishing over 900 malicious packages. The yfinancee package was among those distributed as part of this campaign.

The malicious packages installed browser extensions that performed clipboard manipulation and cryptocurrency wallet address replacement attacks. This technique allowed attackers to intercept and modify cryptocurrency transactions by replacing legitimate wallet addresses with attacker-controlled addresses when users copied and pasted them.

The campaign was identified and documented by the OpenSSF's malicious-packages project (MAL-2023-2454), which tracks confirmed malicious software supply chain incidents. The incident has been cataloged and is no longer active on PyPI.

Indicators of compromise

Packages
  • yfinancee

Remediation

  • Remove yfinancee and any other packages from the identified malicious package list from affected systems
  • Audit installed browser extensions and remove any suspicious or unfamiliar extensions
  • Review cryptocurrency transaction history for any unauthorized address replacements
  • Use package verification tools and check PyPI advisories before installing packages
  • Monitor for similar malicious package campaigns and maintain updated security advisories

Sources

  1. GitHub Advisory GHSA-fqqp-chq5-9vcp · GitHub Advisory Database

Cite this entry

"Malicious code in yfinancee (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfinancee-pypi-18k1i0

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