Malicious code in Reactive.GUI.Winforms (NuGet)
Malicious code was discovered in the Reactive.GUI.Winforms NuGet package. The package was identified by the OpenSSF malicious packages project and reported via GitHub Advisory GHSA-45h9-gh73-7ghq.
- Disclosed
- Last updated
- Blast radius
- Developers and applications using Reactive.GUI.Winforms from NuGet
- Ecosystems
- Attack vectors
- Affected entities
- Reactive.GUI.WinformsNuGet package
The Reactive.GUI.Winforms package on NuGet was found to contain malicious code. This incident was identified and documented by the OpenSSF's malicious packages project (MAL-2024-4623) and subsequently reported as GitHub Advisory GHSA-45h9-gh73-7ghq.\n\nThe package is a .NET/NuGet ecosystem component, and the presence of malicious code represents a direct supply chain compromise affecting any developer or application that installed or used this package.\n\nThe incident was disclosed on July 20, 2026, and has been cataloged by GitHub's security advisory system.
Indicators of compromise
- Packages
- Reactive.GUI.Winforms
Remediation
- Remove or uninstall the Reactive.GUI.Winforms package from all projects and environments
- Review project dependencies and build artifacts for any signs of compromise
- Audit any systems that may have executed code from this package
- Use alternative, verified packages for GUI functionality in Winforms applications
- Monitor NuGet package sources for security advisories and use package verification tools
Sources
- GitHub Advisory GHSA-45h9-gh73-7ghq · GitHub Advisory Database
Cite this entry
"Malicious code in Reactive.GUI.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-reactive-gui-winforms-nuget-1bmr1t
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