CVE-2026-126187
Unauthenticated RCE in React Server Components (rare case)
- CVSS 4.0
- 9.5 critical
- EPSS
- 2%p78
- Published
- ·
- Modified
Crafted payloads against frameworks that support React Server Components can cause remote code execution. An unauthenticated network attacker can trigger it without user interaction, but only in extremely rare cases where responses transport multiple typed arrays and include an attacker-controlled value. It affects react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack. Apps that do not use a server, or a framework or bundler that supports React Server Components, are not affected.
What to do: Upgrade react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack to 19.0.09, 19.1.10, 19.2.9, or 19.3.1 immediately.
| Product | Affected | Fixed in |
|---|---|---|
| react-server-dom-webpack | 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8, and 19.3.0 | 19.0.09, 19.1.10, 19.2.9, and 19.3.1 |
| react-server-dom-parcel | 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8, and 19.3.0 | 19.0.09, 19.1.10, 19.2.9, and 19.3.1 |
| react-server-dom-turbopack | 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8, and 19.3.0 | 19.0.09, 19.1.10, 19.2.9, and 19.3.1 |
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads targeting frameworks that support React Server Components. The vulnerability only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Applications whose React code does not use a server are not affected. Applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected. This issue is fixed in versions 19.0.9, 19.1.10, 19.2.9, and 19.3.1.
- Ecosystems
- npm
- Weakness
- CWE-502
- Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- GHSA
- GHSA-xqc2-xf4c-x3h3 (critical)
In the news
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