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supplychainattack.orgSupply chain attack incident catalog
resolvedcritical

Malicious code in ypcodestyle (PyPI)

Malicious code was distributed in the ypcodestyle package on PyPI as part of a campaign distributing 900+ compromised packages. The malware installs a malicious browser extension designed to manipulate the clipboard and replace cryptocurrency wallet addresses.

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Disclosed
Last updated
Blast radius
900+ malicious packages distributed; targets local browsers and cryptocurrency wallets
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • ypcodestyleMalicious package distributed via PyPI

An attacker distributed over 900 malicious packages via PyPI, including the ypcodestyle package, as part of a coordinated supply chain attack. The compromised packages contained code that installed malicious browser extensions on infected systems.\n\nThe malicious extension targeted users' clipboard functionality and cryptocurrency wallets, replacing legitimate wallet addresses with attacker-controlled addresses to redirect cryptocurrency transactions.\n\nThis incident was identified and documented by Checkmarx and credited to the OpenSSF's malicious-packages repository (MAL-2023-2464). The attack demonstrates the risk of typosquatting and compromised legitimate-looking package names on public package repositories.

Indicators of compromise

Packages
  • ypcodestyle

Remediation

  • Immediately uninstall ypcodestyle and any other suspicious packages from affected systems
  • Audit PyPI package installations for the presence of 900+ known malicious packages from this campaign
  • Review browser extensions for unauthorized or suspicious entries
  • Monitor cryptocurrency wallet transactions for unauthorized activity
  • Update to legitimate versions of required packages from trusted sources
  • Implement package verification and integrity checks in dependency management workflows

Sources

  1. GitHub Advisory GHSA-j7fj-mmff-4pr8 · GitHub Advisory Database

Cite this entry

"Malicious code in ypcodestyle (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-ypcodestyle-pypi-c92b16

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