What is the React Next.js DoS vulnerability?

High-severity CVE-2025-55184 causes infinite loops via crafted requests in React Server Components, hanging servers.

Are Deno Deploy apps safe from this React DoS bug?

Yes—automatic runtime mitigations applied December 11, 2025. Still patch libs for full coverage.

How do I patch Next.js for this vulnerability?

Upgrade to Next 16.0.9+, 15.5.8+, or 14.2.34+. Deno: `deno update next@latest`.

[React/Next.js DoS Bug] Deno Deploy Users Safe, Others Patch Now

Everyone figured React Server Components were the future of server-side rendering—bulletproof, shiny. Then this DoS bomb drops, hanging servers with one bad request. Deno swoops in; others scramble.

Dev Digest Apr 14, 2026 4 min read

Server crash graphic with React and Next.js logos, Deno shield protecting

⚡ Key Takeaways

High-severity DoS in React Server Components/Next.js hangs servers via infinite loop deserialization. 𝕏
Deno Deploy auto-patched all users with runtime mitigations—others must manually upgrade immediately. 𝕏
Second major RSC vuln in weeks; echoes early Node.js security woes, urging framework rethink. 𝕏

Written by

Ibrahim Samil Ceyisakar

Founder and Editor in Chief. Technology entrepreneur tracking AI, digital business, and global market trends.

#Deno Deploy #RSC Security #cve-2025-55184 #nextjs-dos #react-vulnerability

Worth sharing?

Get the best Developer Tools stories of the week in your inbox — no noise, no spam.

Originally reported by Deno Blog

⚡ Key Takeaways

The 60-Second TL;DR

Ibrahim Samil Ceyisakar

Share this article

Worth sharing?

Related Stories

[RCE Vulnerability] React Server Functions/Next.js Exploited – Deno Deploy Safe

Next.js 16 Hardens RSC Against RCE Nightmares, Unlocks React 19.2 Speed — But Don't Skip the Zod

Deno Sandbox: Secure LLM Code Without the Hack Nightmare

5 Key Upgrades in Deno Deploy's Full Relaunch

Stay in the loop