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A revisit of remote Spectre attacks on Cloudflare Workers

calendar_today August 19, 2026 person Martin Schwarzl domain cloudflare

In 2024 and 2025, we reassessed remote Spectre attacks on our Workers infrastructure. We share details about the new attack primitives like Spectre gadgets, remote timers, achieving co-location and how new defenses further harden Cloudflare Workers.

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