Malicious code in zwtenc1 (RubyGems)
Malicious code was discovered in the zwtenc1 RubyGems package. The package was identified by the OpenSSF malicious packages project and assigned advisory GHSA-958h-6v7m-55q9.
- Disclosed
- Last updated
- Blast radius
- All users of the zwtenc1 RubyGems package
- Ecosystems
- Attack vectors
- Affected entities
- zwtenc1RubyGems package
The zwtenc1 package on RubyGems was found to contain malicious code. This incident was identified and documented by the OpenSSF's malicious packages project, which maintains a catalog of confirmed malicious software supply chain incidents.\n\nThe package was assigned GitHub Security Advisory GHSA-958h-6v7m-55q9 and classified as critical severity. The discovery was credited to the OpenSSF malicious packages initiative, which systematically identifies and catalogs compromised packages across multiple ecosystems.\n\nAny system that installed or used the zwtenc1 package may have been affected by the malicious code.
Indicators of compromise
- Packages
- zwtenc1
Remediation
- Remove the zwtenc1 package from all systems and dependencies
- Audit systems that previously installed zwtenc1 for signs of compromise
- Review and update any code that depended on zwtenc1
- Monitor for any suspicious activity on systems that may have executed code from this package
Sources
- GitHub Advisory GHSA-958h-6v7m-55q9 · GitHub Advisory Database
Cite this entry
"Malicious code in zwtenc1 (RubyGems)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 18, 2026; last updated July 18, 2026. https://supplychainattack.org/incident/malicious-code-in-zwtenc1-rubygems-1b4p8v
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