# A revisit of remote Spectre attacks on Cloudflare Workers

DevFeed: [A revisit of remote Spectre attacks on Cloudflare Workers](<https://devfeed.tech/articles/a-revisit-of-remote-spectre-attacks-on-cloudflare-workers-118.md>)

Original publisher: [Read original article](<https://blog.cloudflare.com/revisiting-spectre-attacks-on-workers/>)

Author: Albert Pedersen

Published: 2026-08-19T16:00:28Z

Content type: article

Language: en

Sources: [Cloudflare Blog](<https://devfeed.tech/sources/cloudflare-blog.md>)

Topics: [vulnerability](<https://devfeed.tech/topics/vulnerability.md>), [Processes](<https://devfeed.tech/topics/processes.md>), [out-of-process](<https://devfeed.tech/topics/out-of-process.md>)

Tags: [attacks](<https://devfeed.tech/tags/attacks.md>), [cloudflare](<https://devfeed.tech/tags/cloudflare.md>), [cloudflare-workers](<https://devfeed.tech/tags/cloudflare-workers.md>), [edge](<https://devfeed.tech/tags/edge.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [linux](<https://devfeed.tech/tags/linux.md>), [memory](<https://devfeed.tech/tags/memory.md>), [processes](<https://devfeed.tech/tags/processes.md>), [remote](<https://devfeed.tech/tags/remote.md>), [research](<https://devfeed.tech/tags/research.md>), [sandbox](<https://devfeed.tech/tags/sandbox.md>), [security](<https://devfeed.tech/tags/security.md>), [vulnerabilities](<https://devfeed.tech/tags/vulnerabilities.md>)

## AI overview

Cloudflare reassessed remote Spectre attacks against Workers and found that a limitation in Dynamic Process Isolation allowed reliable data leakage in production. The attack is already mitigated through improved isolation measures, including the V8 Sandbox and in-process isolation.

## Source excerpt

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.