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resolvedcritical

Malicious code in Whatsapp.API (NuGet)

Malicious code was discovered in multiple versions of the Whatsapp.API NuGet package. The package was compromised and distributed through the NuGet package registry.

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Disclosed
Last updated
Blast radius
All users of affected Whatsapp.API NuGet package versions
Ecosystems
NuGet
Attack vectors
Compromised package
Affected entities
  • Whatsapp.APINuGet package with malicious code

The Whatsapp.API package on NuGet was found to contain malicious code across multiple versions. This incident was identified and documented by the OpenSSF malicious packages project.\n\nThe compromised package was available on the NuGet package registry, potentially exposing any developer or application that installed affected versions to the malicious payload.\n\nThe incident was disclosed on July 20, 2026, and has been cataloged in the GitHub Security Advisory database (GHSA-xwf9-qp92-h544) as well as the OpenSSF malicious packages repository.

Indicators of compromise

Packages
  • Whatsapp.API

Remediation

  • Remove all versions of Whatsapp.API from affected projects immediately
  • Audit project dependencies and build artifacts for any signs of compromise
  • Review and rotate any credentials or secrets that may have been exposed
  • Update to a clean, verified version of the package if a legitimate replacement is available
  • Monitor systems for any suspicious activity or unauthorized access

Sources

  1. GitHub Advisory GHSA-xwf9-qp92-h544 · GitHub Advisory Database

Cite this entry

"Malicious code in Whatsapp.API (NuGet)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 20, 2026; last updated July 20, 2026. https://supplychainattack.org/incident/malicious-code-in-whatsapp-api-nuget-12j10g

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