{"schema_version":"onlylabs.public_signal.v1","title":"Cloudflare (Workers AI) Writing: A revisit of remote Spectre attacks on Cloudflare Workers","description":"Cloudflare (Workers AI) writing signal with public source context, captured evidence pages, related signals, and category-scoped analysis context.","url":"https://onlylabs.fyi/signals/6def799a-b300-4b85-9de2-fadf1ada2676","json_url":"https://onlylabs.fyi/signals/6def799a-b300-4b85-9de2-fadf1ada2676/signal.json","generated_at":"2026-08-28T17:49:21.709Z","evidence_latest_fetched_at":"2026-08-19T16:02:05.985405+00:00","signal_first_seen_at":"2026-08-19T16:00:51.555612+00:00","org":{"slug":"cloudflare","name":"Cloudflare (Workers AI)","category":"neocloud","category_label":"Neocloud","dossier_url":"https://onlylabs.fyi/labs/cloudflare","dossier_json_url":"https://onlylabs.fyi/labs/cloudflare/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/6def799a-b300-4b85-9de2-fadf1ada2676","signal_json":"https://onlylabs.fyi/signals/6def799a-b300-4b85-9de2-fadf1ada2676/signal.json","source":"https://blog.cloudflare.com/revisiting-spectre-attacks-on-workers/","lab_dossier":"https://onlylabs.fyi/labs/cloudflare","lab_dossier_json":"https://onlylabs.fyi/labs/cloudflare/dossier.json","analysis":"https://onlylabs.fyi/analysis/cloudflare","analysis_json":"https://onlylabs.fyi/analysis/cloudflare/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/cloudflare/evidence.json","category":"https://onlylabs.fyi/neoclouds","category_json":"https://onlylabs.fyi/neoclouds.json","category_feed":"https://onlylabs.fyi/neoclouds/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json?category=neocloud","topic":"https://onlylabs.fyi/topics/talking","topic_signals_json":"https://onlylabs.fyi/topics/talking/signals.json?category=neocloud","topic_feed":"https://onlylabs.fyi/topics/talking/feed.xml?category=neocloud","data_business":null},"answer_pack":{"answer":"Cloudflare (Workers AI) published A revisit of remote Spectre attacks on Cloudflare Workers. 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for this category, keep conclusions tied to category-specific strategy, source evidence, and follow-up questions.","required_sources":[{"label":"signal_json","url":"https://onlylabs.fyi/signals/6def799a-b300-4b85-9de2-fadf1ada2676/signal.json","required":true},{"label":"source","url":"https://blog.cloudflare.com/revisiting-spectre-attacks-on-workers/","required":true},{"label":"dossier_json","url":"https://onlylabs.fyi/labs/cloudflare/dossier.json","required":true},{"label":"analysis_evidence_json","url":"https://onlylabs.fyi/analysis/cloudflare/evidence.json","required":true},{"label":"topic_signals_json","url":"https://onlylabs.fyi/topics/talking/signals.json?category=neocloud","required":false},{"label":"data_radar_json","url":null,"required":false}],"expected_output":["one-paragraph source-grounded interpretation","category-specific implication","confidence and missing evidence","recommended next source to inspect"],"prompt_seed":"Using only the linked onlylabs JSON, captured source context, and cited evidence, analyze Cloudflare (Workers AI)'s writing signal \"A revisit of remote Spectre attacks on Cloudflare Workers\" for neocloud strategy."},"semantic_triples":[{"subject":"Cloudflare (Workers AI)","predicate":"published","object":"A revisit of remote Spectre attacks on Cloudflare Workers","text":"Cloudflare (Workers AI) published A revisit of remote Spectre attacks on Cloudflare Workers."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"is classified as","object":"writing signal","text":"A revisit of remote Spectre attacks on Cloudflare Workers is classified as writing signal."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"belongs to","object":"talking desk","text":"A revisit of remote Spectre attacks on Cloudflare Workers belongs to talking desk."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has evidence coverage","object":"1 captured evidence page","text":"A revisit of remote Spectre attacks on Cloudflare Workers has evidence coverage 1 captured evidence page."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has captured page count","object":"1","text":"A revisit of remote Spectre attacks on Cloudflare Workers has captured page count 1."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has readable page count","object":"1","text":"A revisit of remote Spectre attacks on Cloudflare Workers has readable page count 1."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has related signal count","object":"6","text":"A revisit of remote Spectre attacks on Cloudflare Workers has related signal count 6."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has analysis playbook objective","object":"Turn public writing and discussion into a readable map of research themes, product framing, policy posture, launch narratives, and market attention.","text":"A revisit of remote Spectre attacks on Cloudflare Workers has analysis playbook objective Turn public writing and discussion into a readable map of research themes, product framing, policy posture, launch narratives, and market attention.."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has source host","object":"blog.cloudflare.com","text":"A revisit of remote Spectre attacks on Cloudflare Workers has source host blog.cloudflare.com."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has lab","object":"Cloudflare (Workers AI)","text":"A revisit of remote Spectre attacks on Cloudflare Workers has lab Cloudflare (Workers AI)."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has signal desk","object":"talking","text":"A revisit of remote Spectre attacks on Cloudflare Workers has signal desk talking."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has source host","object":"blog.cloudflare.com","text":"A revisit of remote Spectre attacks on Cloudflare Workers has source host blog.cloudflare.com."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has author","object":"Martin Schwarzl","text":"A revisit of remote Spectre attacks on Cloudflare Workers has author Martin Schwarzl."},{"subject":"A revisit of remote Spectre attacks on Cloudflare Workers","predicate":"has notability","object":"Security research on Cloudflare Workers; 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Based on the results, we shipped a production defense called Dynamic Process Isolation (DyPrIs), which identifies maliciously looking scripts and isolates them into separate processes. Since then, newer techniques in the area of stabilizing Spectre attacks have been discovered. To understand if these techniques posed a threat to our Workers production environment, we decided to internally reassess the remote Spectre attack. Building an updated proof-of-concept on the production environment allowed us to empirically assess the risk of Spectre attacks under production workloads. To mount a successful side-channel attack in production, an external attacker has to overcome additional obstacles such as activity on shared hardware resources, interrupts, context switches, and coarse-grained timers. Our research uncovered a limitation in the implementation of DyPrIs and we managed to demonstrate a remote Spectre attack reliably leaking up to 12 bit/s with a 99% accuracy in the production environment of Cloudflare Workers. 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