Vulnerability details

CVE-2026-126187

react react

React: Unauthenticated Remote Code Execution in React Server Components

CVSS 4.0

9.5Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.5Critical	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
react	react	>= 19.0.0, < 19.0.9	CVEProject cvelistV5 (CNA)
react	react	>= 19.1.0, < 19.1.10	CVEProject cvelistV5 (CNA)
react	react	>= 19.2.0, < 19.2.9	CVEProject cvelistV5 (CNA)
react	react	>= 19.3.0, < 19.3.1	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3 x_refsource_CONFIRM
https://github.com/react/react/pull/37842 x_refsource_MISC
https://github.com/react/react/pull/37843 x_refsource_MISC
https://github.com/react/react/pull/37844 x_refsource_MISC
https://github.com/react/react/pull/37845 x_refsource_MISC
https://github.com/react/react/pull/37846 x_refsource_MISC
https://github.com/react/react/commit/0c9913ae87283f96e868a8f1c20a3389827632d0 x_refsource_MISC
https://github.com/react/react/commit/249ac87b0dadea4ba024d1393e5cb60cf1186080 x_refsource_MISC
https://github.com/react/react/commit/3d06b4005ac0cf9dec37267f26174adfe6d83611 x_refsource_MISC
https://github.com/react/react/commit/611d9217df39cf7b8ac91b2e41fd00555923e904 x_refsource_MISC
https://github.com/react/react/commit/61aa00df822d0eb76d0362eb8b6fdd3527693efe x_refsource_MISC
https://github.com/react/react/releases/tag/v19.0.9 x_refsource_MISC
https://github.com/react/react/releases/tag/v19.1.10 x_refsource_MISC
https://github.com/react/react/releases/tag/v19.2.9 x_refsource_MISC
https://github.com/react/react/releases/tag/v19.3.1 x_refsource_MISC

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Details

Published: 2026-11-11
Last updated: 2026-11-11
State: Published
Assigner (CNA): GitHub_M
Kolun priority: 14 · Low

Exploit prediction (EPSS)

No EPSS score has been published for this CVE yet.

Weaknesses (CWE)

CWE-502
Deserialization of Untrusted Data