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resolvedcritical

Malicious code in Winforms (NuGet)

Malicious code was discovered in multiple versions of the Winforms package on NuGet. The incident was documented by the OpenSSF malicious packages project and published as GitHub advisory GHSA-wq82-5xjm-57wq.

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Disclosed
Last updated
Blast radius
Multiple versions of Winforms package on NuGet
Ecosystems
NuGet
Attack vectors
Compromised package
Affected entities
  • WinformsNuGet package with malicious code

Multiple versions of the Winforms package distributed via NuGet were found to contain malicious code. The vulnerability was identified and documented by the OpenSSF's malicious packages project.\n\nThe incident was published on July 20, 2026, and assigned GitHub advisory identifier GHSA-wq82-5xjm-57wq. The malicious packages affected numerous versions of the Winforms library, a widely-used .NET UI framework.\n\nDevelopers using affected versions of Winforms should immediately update to patched versions and review their systems for any signs of compromise.

Indicators of compromise

Packages
  • Winforms

Remediation

  • Update Winforms package to a non-malicious version from NuGet
  • Review application dependencies and audit any systems that may have used affected versions
  • Monitor for suspicious activity on systems that may have executed code from affected Winforms versions
  • Consult the GitHub advisory GHSA-wq82-5xjm-57wq for specific affected version ranges and remediation guidance

Sources

  1. GitHub Advisory GHSA-wq82-5xjm-57wq · GitHub Advisory Database

Cite this entry

"Malicious code in Winforms (NuGet)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 20, 2026; last updated July 20, 2026. https://supplychainattack.org/incident/malicious-code-in-winforms-nuget-18s7b6

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