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resolvedcritical

Malicious code in Tessa.UI2 (NuGet)

Malicious code was discovered in the Tessa.UI2 NuGet package. The package was identified and cataloged by the OpenSSF malicious packages project.

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Disclosed
Last updated
Blast radius
Tessa.UI2 package consumers on NuGet
Ecosystems
NuGet
Attack vectors
Compromised package
Affected entities
  • Tessa.UI2NuGet package

The Tessa.UI2 package on NuGet was found to contain malicious code. This incident was identified and documented by the OpenSSF's malicious packages project, which maintains a catalog of known malicious software supply chain incidents.\n\nThe package was published on the NuGet package registry and could have been downloaded by developers integrating it into their applications. The OpenSSF attribution and tracking (MAL-2024-4683) indicates this was a confirmed malicious package incident.\n\nThe incident has been documented in the GitHub Advisory Database (GHSA-89jh-v777-4w7h) and the OpenSSF malicious packages repository, indicating the threat has been identified and cataloged for defensive purposes.

Indicators of compromise

Packages
  • Tessa.UI2

Remediation

  • Remove Tessa.UI2 from all projects and dependencies
  • Audit any systems that may have downloaded or used Tessa.UI2
  • Review package dependencies for similar suspicious packages
  • Use NuGet security scanning tools to detect any remaining instances
  • Update to a safe alternative package if available

Sources

  1. GitHub Advisory GHSA-89jh-v777-4w7h · GitHub Advisory Database

Cite this entry

"Malicious code in Tessa.UI2 (NuGet)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 20, 2026; last updated July 20, 2026. https://supplychainattack.org/incident/malicious-code-in-tessa-ui2-nuget-awfpfd

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