The hubert-react-query npm package (version 20.6.8) includes malicious code in its main entry point (index.js) that unconditionally requires a setup.js script. This script dynamically reconstructs Cloudflare Workers hostnames and uses a DNS-TXT base64 fallback channel to download a platform-specific native binary via HTTPS. The binary is saved to temporary system directories with disguised filenames, permissioned as executable, and launched detached from the parent process. The package masquerades this behavior as telemetry but actually delivers an opaque compiled binary unrelated to react-query functionality. Execution occurs simply by requiring the module, leading to full system compromise.

Any system with this package installed or running is considered fully compromised. The malicious binary grants attackers full control over the affected computer. All secrets and keys stored on the compromised system should be considered exposed and must be rotated from a separate, secure device. Removing the package alone does not guarantee removal of all malicious components or persistence mechanisms.

Remove the hubert-react-query package version 20.6.8 immediately from all affected systems. Rotate all secrets, credentials, and keys that were stored or accessible on compromised machines from a secure environment. Because the malicious binary executes automatically on import and may establish persistence, assume full compromise and conduct a thorough incident response. No official patch or fix is available; remediation relies on removal and secret rotation.