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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 rate of an earlier attack demonstrated in 2021.

The end-to-end experiment used an attacker Worker and a victim Worker controlled by the researchers,

8:10 pm, August 19, 2026

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https://thehackernews.com/2026/08/cloudflare-workers-spectre-attack-leaks.html

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https://thehackernews.com/2026/08/cloudflare-workers-spectre-attack-leaks.html

id: 2622
uid: cE4QI
insdate: 2026-08-19 20:10:08
title: Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second
additional: 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 rate of an earlier attack demonstrated in 2021.

The end-to-end experiment used an attacker Worker and a victim Worker controlled by the researchers,
category: Cybersecurity
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guid: https://thehackernews.com/2026/08/cloudflare-workers-spectre-attack-leaks.html
source_url: https://thehackernews.com/2026/08/cloudflare-workers-spectre-attack-leaks.html
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