Vulnerability · Published Apr 8, 2026 · Assigned by Meta
CVE-2026-23869
High 7.5
In plain English
A high-severity unsafe deserialization in react-server-dom-parcel from Meta. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | react-server-dom-parcel | 19.0.5 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-parcel | 19.1.6 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-parcel | 19.2.5 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-turbopack | 19.0.5 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-turbopack | 19.1.6 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-turbopack | 19.2.5 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-webpack | 19.0.5 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-webpack | 19.1.6 | GHSA-479c-33wc-g2pg |
| npm | react-server-dom-webpack | 19.2.5 | GHSA-479c-33wc-g2pg |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Meta | react-server-dom-turbopack | 19.0.0 – through 19.0.419.1.0 – through 19.1.519.2.0 – through 19.2.4 |
| Meta | react-server-dom-parcel | 19.0.0 – through 19.0.419.1.0 – through 19.1.519.2.0 – through 19.2.4 |
| Meta | react-server-dom-webpack | 19.0.0 – through 19.0.419.1.0 – through 19.1.519.2.0 – through 19.2.4 |
Weakness: CWE-502, CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg x_refsource_CONFIRM
- https://access.redhat.com/security/cve/CVE-2026-23869 vdb-entry, x_refsource_REDHAT
- RHBZ#2456663 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json x_sadp-csaf-vex