Miasma Worm Hits 73 Microsoft GitHub Repositories in Major Supply Chain Attack

Ravie LakshmananJun 06, 2026Supply Chain Attack / Malware

Microsoft's GitHub repositories have become the latest to fall victim to the ongoing Miasma self-replicating supply chain attack campaign.

The incident impacted 73 Microsoft repositories across four of its GitHub organizations, including Azure, Azure-Samples, Microsoft, and MicrosoftDocs, per OpenSourceMalware. The development has GitHub to disable access to those repositories.

"Access to this repository has been disabled by GitHub Staff due to a violation of GitHub's terms of service," reads the message when attempting to access the "Azure/azure-functions-host" repository. "If you are the owner of the repository, you may reach out to GitHub Support for more information."

According to OpenSourceMalware, the incident impacts the following repositories -