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What we learned about TEE security from auditing WhatsApp's Private Inference

lowtrailofbitsPublished 2026-04-07

<p>WhatsApp’s new “Private Inference” feature represents one of the most ambitious attempts to combine end-to-end encryption with AI-powered capabilities, such as message summarization. To make this possible, Meta built a system that processes encrypted user messages inside trusted execution environments (TEEs), secure hardware enclaves designed so that not even Meta can access the plaintext. Our

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://blog.trailofbits.com/2026/04/07/what-we-learned-about-tee-security-from-auditing-whatsapps-private-inference/