---
title: "Denial of Service and Source Code Exposure in React Server Components – React"
url: https://daily.dev/posts/denial-of-service-and-source-code-exposure-in-react-server-components-react-ugou2ar0q
source_url: https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components
type: article
source: "React"
published: 2025-12-11T20:28:43.652Z
updated: 2026-02-27T16:58:31.746Z
tags: ["security", "react", "nextjs", "vulnerability"]
reading_time: 4
upvotes: 1
comments: 0
language: en
---

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# Denial of Service and Source Code Exposure in React Server Components – React

**[React](https://daily.dev/sources/react)** · 4 min read · 1 upvotes · 0 comments

## Summary

React Server Components have two new security vulnerabilities: a high-severity Denial of Service (CVE-2025-55184) that can hang servers through malicious HTTP requests, and a medium-severity Source Code Exposure (CVE-2025-55183) that can leak Server Function source code. These affect React versions 19.0.0 through 19.2.1 and frameworks like Next.js, React Router, and Waku. Fixes are available in versions 19.0.2, 19.1.3, and 19.2.2. Apps not using React Server Components or server-side rendering are unaffected. Immediate upgrade is recommended despite hosting provider mitigations being in place.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components>

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Tags: [#security](https://daily.dev/tags/security), [#react](https://daily.dev/tags/react), [#nextjs](https://daily.dev/tags/nextjs), [#vulnerability](https://daily.dev/tags/vulnerability)

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