CVE-2026-126187
React: Unauthenticated Remote Code Execution in React Server Components
Description
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.
INFO
Published Date :
Nov. 10, 2026, 11:17 p.m.
Last Modified :
Nov. 10, 2026, 11:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-126187
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update react-server-dom-webpack to a fixed version.
- Update react-server-dom-parcel to a fixed version.
- Update react-server-dom-turbopack to a fixed version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-126187.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-126187 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-126187
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-126187 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-126187 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Nov. 10, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 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 Added CWE CWE-502 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/126xxx/CVE-2026-126187.json">CVE-2026-126187</a> Added Reference https://github.com/react/react/commit/0c9913ae87283f96e868a8f1c20a3389827632d0 Added Reference https://github.com/react/react/commit/249ac87b0dadea4ba024d1393e5cb60cf1186080 Added Reference https://github.com/react/react/commit/3d06b4005ac0cf9dec37267f26174adfe6d83611 Added Reference https://github.com/react/react/commit/611d9217df39cf7b8ac91b2e41fd00555923e904 Added Reference https://github.com/react/react/commit/61aa00df822d0eb76d0362eb8b6fdd3527693efe Added Reference https://github.com/react/react/pull/37842 Added Reference https://github.com/react/react/pull/37843 Added Reference https://github.com/react/react/pull/37844 Added Reference https://github.com/react/react/pull/37845 Added Reference https://github.com/react/react/pull/37846 Added Reference https://github.com/react/react/releases/tag/v19.0.9 Added Reference https://github.com/react/react/releases/tag/v19.1.10 Added Reference https://github.com/react/react/releases/tag/v19.2.9 Added Reference https://github.com/react/react/releases/tag/v19.3.1 Added Reference https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3