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resolvedcritical

Malicious code in zwxbcstan (RubyGems)

Malicious code was discovered in the zwxbcstan RubyGems package. The package was identified and cataloged by the OpenSSF malicious packages project.

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

The zwxbcstan package on RubyGems was found to contain malicious code. This incident was identified and documented by the OpenSSF (Open Source Security Foundation) as part of their malicious packages tracking effort.\n\nThe package was assigned the identifier MAL-2026-9932 in the OpenSSF malicious packages database. The advisory was published on GitHub on 2026-07-18.\n\nAny system that installed or used the zwxbcstan package may have been affected by the malicious code embedded within it.

Indicators of compromise

Packages
  • zwxbcstan

Remediation

  • Remove the zwxbcstan package from all systems where it was installed
  • Audit systems that had zwxbcstan installed for signs of compromise
  • Review dependency trees to identify all affected applications
  • Update to a clean version if a legitimate replacement is available, or remove the dependency entirely

Sources

  1. GitHub Advisory GHSA-7jf3-8f95-vpc5 · GitHub Advisory Database

Cite this entry

"Malicious code in zwxbcstan (RubyGems)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 18, 2026; last updated July 18, 2026. https://supplychainattack.org/incident/malicious-code-in-zwxbcstan-rubygems-12gwm0

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