Resource exhaustion in Facebook React-Server-Dom-Parcel
CVE-2026-23870
A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.015 (74.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Facebook React-Server-Dom-Parcel
- Facebook React-Server-Dom-Turbopack
- Facebook React-Server-Dom-Webpack
- Meta React-Server-Dom-Parcel — versions 19.0.0, 19.1.0, 19.2.0
- Meta React-Server-Dom-Turbopack — versions 19.0.0, 19.1.0, 19.2.0
- Meta React-Server-Dom-Webpack — versions 19.0.0, 19.1.0, 19.2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/facebook/react/security/advisories/GHSA-rv78-f8rc-xrxh (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-23870?
- CVE-2026-23870 is a high-severity vulnerability in Facebook React-Server-Dom-Parcel, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-05-06.
- How severe is CVE-2026-23870?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-23870 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.