Review reviewHigh

CVE-2026-23869

Meta react-server-dom-turbopack, react-server-dom-parcel, react-server-dom-webpack

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.

CVSS: 7.5
EPSS: 1.55%
CISA KEV: Not listed
Published: 2026.04.09

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability1.55%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Meta react-server-dom-turbopack, react-server-dom-parcel, react-server-dom-webpack
Affected versions: >= 19.0.0 <= 19.0.4, >= 19.1.0 <= 19.1.5, >= 19.2.0 <= 19.2.4
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Meta react-server-dom-turbopack, react-server-dom-parcel, react-server-dom-webpack and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: 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