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resolvedcritical

Malicious code in Tessa.Windows.V2 (NuGet)

Malicious code was discovered in the Tessa.Windows.V2 NuGet package. The package was identified by the OpenSSF malicious packages project and reported via GitHub Security Advisory GHSA-vgqj-xf7p-6mh4.

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Disclosed
Last updated
Blast radius
Unknown; depends on adoption of affected versions
Ecosystems
NuGet
Attack vectors
Compromised package
Affected entities
  • Tessa.Windows.V2

A malicious code incident was identified in the Tessa.Windows.V2 package on NuGet. The discovery was credited to the OpenSSF's malicious packages project, which maintains a catalog of known malicious software supply chain incidents.

The incident was disclosed via GitHub Security Advisory GHSA-vgqj-xf7p-6mh4 on July 20, 2026. The OpenSSF malicious packages repository (referenced as MAL-2024-4686) contains the technical details of the compromise.

Affected developers and organizations using Tessa.Windows.V2 should review their dependencies and remove or update to a clean version if available.

Indicators of compromise

Packages
  • Tessa.Windows.V2

Remediation

  • Remove or uninstall the affected Tessa.Windows.V2 package from your projects
  • Check your NuGet package history and build artifacts for any versions of Tessa.Windows.V2 that may have been used
  • Review the OpenSSF malicious packages database (MAL-2024-4686) for specific technical indicators and payload details
  • If a patched version is available, update to the latest clean release
  • Audit systems that may have executed code from this package for signs of compromise

Sources

  1. GitHub Advisory GHSA-vgqj-xf7p-6mh4 · GitHub Advisory Database

Cite this entry

"Malicious code in Tessa.Windows.V2 (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-windows-v2-nuget-1dhc6f

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