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CVE-2026-23869

HIGH
7.5
CVSS Score
Published: April 8, 2026 at 07:11 PM UTC
Updated: July 25, 2026 at 11:21 AM UTC
3 products affected across 1 vendorReact Server Dom WebpackReact Server Dom ParcelReact Server Dom Turbopack

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

React Server Dom Parcel· Facebooknpm
60%
19.0.0 ≤ v ≤ 19.0.419.1.0 ≤ v ≤ 19.1.519.2.0 ≤ v ≤ 19.2.419.0.019.1.019.2.0
React Server Dom Turbopack· Facebooknpm
60%
19.0.0 ≤ v ≤ 19.0.419.1.0 ≤ v ≤ 19.1.519.2.0 ≤ v ≤ 19.2.419.0.019.1.019.2.0
React Server Dom Webpack· Facebooknpm
60%
19.0.0 ≤ v ≤ 19.0.419.1.0 ≤ v ≤ 19.1.519.2.0 ≤ v ≤ 19.2.419.0.019.1.019.2.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-23869
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2456663
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHMeta
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-400CWE-502CWE-770

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