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resolvedcritical

Malicious code in yfinnance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfinnance, 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
  • yfinnancePyPI package

A large-scale malicious package campaign distributed over 900 compromised packages via PyPI. The yfinnance package was among those affected, containing code that installed malicious browser extensions on infected systems.\n\nThe malicious extensions were designed to intercept and manipulate clipboard data, specifically targeting cryptocurrency wallet addresses. This allowed attackers to replace legitimate wallet addresses with attacker-controlled addresses when users attempted to paste addresses for cryptocurrency transactions.\n\nThe incident was identified and documented by Checkmarx and credited to the OpenSSF malicious-packages repository, which tracks confirmed malicious package distributions across package ecosystems.

Indicators of compromise

Packages
  • yfinnance

Remediation

  • Remove or uninstall the yfinnance package immediately
  • Scan systems for malicious browser extensions and remove any suspicious extensions
  • Review browser extension permissions and remove any extensions with clipboard access that are not explicitly trusted
  • Audit recent cryptocurrency transactions for any suspicious wallet address replacements
  • Update to a clean version of any legitimate package if available, or use alternative packages
  • Monitor PyPI and security advisories for updates on affected packages

Sources

  1. GitHub Advisory GHSA-9fh3-jr44-89fq · GitHub Advisory Database

Cite this entry

"Malicious code in yfinnance (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfinnance-pypi-uc0kzn

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