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resolvedcritical

Malicious code in zwtlist (RubyGems)

Malicious code was discovered in the zwtlist RubyGems package. The package was identified by the OpenSSF malicious packages project and assigned identifier MAL-2026-9917.

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Disclosed
Last updated
Blast radius
All users of the zwtlist RubyGems package
Ecosystems
RubyGems
Attack vectors
Compromised package
Affected entities
  • zwtlistRubyGems package

The zwtlist package on RubyGems was found to contain malicious code. The discovery was credited to the OpenSSF (Open Source Security Foundation) malicious packages project, which maintains a catalog of known malicious open-source packages.\n\nThe incident was formally documented in the OpenSSF malicious packages repository with identifier MAL-2026-9917. This classification indicates the package was confirmed to contain intentionally malicious code rather than a vulnerability in legitimate code.\n\nAny system that installed or used the zwtlist package may be affected. Users should immediately remove the package and audit their systems for any unauthorized activity.

Indicators of compromise

Packages
  • zwtlist

Remediation

  • Remove the zwtlist package from all affected systems immediately
  • Audit systems for any unauthorized access or modifications that may have occurred
  • Review application logs for suspicious activity related to zwtlist execution
  • Update dependency management to prevent reinstallation of the malicious package
  • Consider using alternative packages for the functionality previously provided by zwtlist

Sources

  1. GitHub Advisory GHSA-vx2m-rg7c-v4jh · GitHub Advisory Database

Cite this entry

"Malicious code in zwtlist (RubyGems)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 18, 2026; last updated July 18, 2026. https://supplychainattack.org/incident/malicious-code-in-zwtlist-rubygems-gfc9hb

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