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'Exploitation is imminent' of max-severity React bug

  • On Wednesday, the React team disclosed CVE-2025-55182, a maximum-severity unauthenticated remote code execution flaw in React Server Components.
  • Developer Lachlan Davidson, lead of security innovation at Carapace, discovered and reported a deserialization defect to Meta on Saturday affecting Server Function endpoints.
  • Affected versions include 19.0, 19.1.0, 19.1.1, and 19.2.0 of react-server-dom-webpack, react-server-dom-parcel, React-server-dom-turbopack; maintainers recommend upgrading to 19.0.1, 19.1.2, and 19.2.1.
  • Researchers warned no attacks have been observed yet but expect exploitation soon and Meta privately notified hosting providers and cloud operators, sharing web application firewall rules as temporary mitigation.
  • Security firms warned that downstream frameworks face long-tail impacts, while Vercel assigned CVE-2025-66478 and issued a patch alongside Meta's emergency patch rollout.
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The Register broke the news in on Wednesday, December 3, 2025.
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