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Cloudflare Restores Service After Brief Global Outage Tied to React Security Mitigation

Cloudflare says a firewall change tied to its new React RSC protection caused the disruption rather than an attack.

Overview

  • The disruption began around 09:50 UTC and temporarily affected the company’s dashboard, related APIs and some Workers traffic.
  • Connectivity issues hit services including LinkedIn, Zoom, Fortnite, Canva, Shopify, Coinbase and League of Legends, with spikes logged by Downdetector in multiple countries.
  • CTO Dane Knecht said records were disabled to help mitigate CVE-2025-55182 affecting React Server Components and emphasized that the incident was not an attack.
  • Cloudflare said service returned within minutes as it probes how firewall handling and a database change during planned maintenance interacted, according to initial assessments shared by a security firm.
  • This was the second outage in weeks after a major November incident, intensifying scrutiny of the internet’s dependence on a small number of infrastructure providers.