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Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second

Cybersecurity researchers have disclosed details of a remote Spectre attack against Cloudflare Workers that leaked a JSON Web Token (JWT) from a co-located Worker in the production environment at up to 12 bits per second, 360 times the…

Source AI Summary Published August 19, 2026 Brief Under 1 min brief
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AI Summary

Researchers have detailed a remote Spectre attack targeting Cloudflare Workers that can exfiltrate a JSON Web Token from a co‑located worker in production at rates up to 12 bits per second, roughly 360 times faster than a similar 2021 demonstration. The attack exploits side‑channel leakage to read the JWT, highlighting a significant vulnerability in the serverless environment.

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