---
id: CVE-2026-23869
title: >-
  A denial of service vulnerability exists in React Server Components, affecting
  the following packages: react-server-dom-parcel, react-server-dom-turbopack
  and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through
  19.1.…
summary: >-
  A denial of service vulnerability exists in React Server Components, affecting
  the following packages: react-server-dom-parcel, react-server-dom-turbopack
  and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through
  19.1.…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-502
  - CWE-770
published: '2026-04-08'
updated: '2026-07-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23869'
references:
  - url: 'https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg'
    label: cve-assign@fb.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-23869'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2456663'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
  - exploit-available
epss: 0.01551
epssPercentile: 0.74
ingestedAt: '2026-07-26T10:11:58.594Z'
exploits:
  github: 3
  githubRepos:
    - 'https://github.com/yohannslm/CVE-2026-23869'
    - 'https://github.com/cybertechajju/CVE-2026-23869-Exploit'
    - >-
      https://github.com/shaheryar773/mitigate-cve-2026-23869-react-server-component-loops
  checkedAt: '2026-09-25T08:20:53.235Z'
exploitAvailable: true
---

## Overview

A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.