Meta React up to 19.0.8/19.1.9/19.2.8/19.3.0 React Server Components code injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Meta React up to 19.0.8/19.1.9/19.2.8/19.3.0. This vulnerability affects unknown code of the component React Server Components. The manipulation results in code injection. This vulnerability is known as CVE-2026-126187. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Meta React up to 19.0.8/19.1.9/19.2.8/19.3.0. Affected is an unknown functionality of the component React Server Components. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-126187 since 11/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 19.0.9, 19.1.10, 19.2.9 or 19.3.1 eliminates this vulnerability.

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Productinfo

Type

• JavaScript Library

Vendor

• Meta

Name

• React

Version

• 19.0
• 19.0.0
• 19.0.1
• 19.0.2
• 19.0.3
• 19.0.4
• 19.0.5
• 19.0.6
• 19.0.7
• 19.0.8
• 19.1
• 19.1.0
• 19.1.1
• 19.1.2
• 19.1.3
• 19.1.4
• 19.1.5
• 19.1.6
• 19.1.7
• 19.1.8
• 19.1.9
• 19.2
• 19.2.0
• 19.2.1
• 19.2.2
• 19.2.3
• 19.2.4
• 19.2.5
• 19.2.6
• 19.2.7
• 19.2.8
• 19.3.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

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