
Mini Shai-Hulud Copycats and the TanStack Wave: OpenAI Hit, Mistral Extorted, and Four Copycat npm Packages Hit the Registry
OpenAI has disclosed two employee devices were compromised in the May 11, 2026 Mini Shai-Hulud TanStack supply chain attack, with internal source code repositories accessed and iOS, macOS, and Windows code-signing certificates rotated. Mistral AI confirmed one developer device was hit and is facing a $25,000 TeamPCP extortion demand for an alleged 5 GB source code leak. Days later, TeamPCP launched a $1,000 Monero “supply chain attack contest” on BreachForums with the Shai-Hulud worm source code attached, and OX Security disclosed the first observed copycat campaign from a new actor publishing four malicious npm packages. Phoenix Security’s PHX-Neural scanner has independently flagged a 174,659-weekly-download PyPI package (nicegui 3.12.0) with a 100/100 behavioral score and full Shai-Hulud-aligned ATT&CK coverage. This article covers the upstream TanStack wave, the named victim disclosures, the TeamPCP infrastructure aging analysis, the technical breakdown of the four copycat packages, and the PHX-Neural behavioral evidence on the adjacent PyPI signal.





