TL;DR
A coordinated supply chain attack on May 11, 2026 compromised over 170 npm packages and 2 PyPI packages, totaling 404 malicious versions. The attacker hit the entire TanStack router ecosystem (42 packages), Mistral AI’s SDK suite (on both npm and PyPI), UiPath’s automation tooling (65 packages), OpenSearch (1.3M weekly npm downloads), and Guardrails AI (PyPI). This is one of the largest coordinated registry poisoning events observed in 2026, and the first to span both npm and PyPI in a single campaign.
Affected packages include (full list in appendix):
Over 400 compromised npm package versions and at least 2 PyPI packages published in a coordinated supply chain attack targeting TanStack, Mistral AI, UiPath, OpenSearch, guardrails-ai, and dozens of other packages.
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