On November 18, 2025, nearly 20% of the global internet vanished in seconds. Cloudflare’s catastrophic outage wasn't a cyberattack—it was a single internal logic error. This comprehensive forensic analysis explores the "latent bug" that triggered a global "fail-closed" loop, severing connectivity for giants like OpenAI and Coinbase. We dissect the technical anatomy of the crash, the "death spiral" of observability systems, and the critical lessons for future digital infrastructure.
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On November 18, 2025, nearly 20% of the global internet vanished in seconds. Cloudflare’s catastrophic outage wasn't a cyberattack—it was a single internal logic error. This comprehensive forensic analysis explores the "latent bug" that triggered a global "fail-closed" loop, severing connectivity for giants like OpenAI and Coinbase. We dissect the technical anatomy of the crash, the "death spiral" of observability systems, and the critical lessons for future digital infrastructure.
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