React: Unauthenticated Remote Code Execution in React Server Components
Summary
| CVE | CVE-2026-126187 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-10 23:17:20 UTC |
| Updated | 2026-11-10 23:17:20 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.5 CRITICAL from [email protected]
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
Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 9.5 | CRITICAL | 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/C... |
| 4.0 | CNA | DECLARED | 9.5 | CRITICAL | 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 |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
PresentPrivileges Required
NoneUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
HighSub Integrity
HighSub Availability
NoneCVSS: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
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/react/react/commit/61aa00df822d0eb76d0362eb8b6fdd3527693efe | [email protected] | github.com | |
| github.com/react/react/pull/37844 | [email protected] | github.com | |
| github.com/react/react/commit/249ac87b0dadea4ba024d1393e5cb60cf1186080 | [email protected] | github.com | |
| github.com/react/react/releases/tag/v19.0.9 | [email protected] | github.com | |
| github.com/react/react/releases/tag/v19.1.10 | [email protected] | github.com | |
| github.com/react/react/pull/37843 | [email protected] | github.com | |
| github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3 | [email protected] | github.com | |
| github.com/react/react/commit/0c9913ae87283f96e868a8f1c20a3389827632d0 | [email protected] | github.com | |
| github.com/react/react/releases/tag/v19.3.1 | [email protected] | github.com | |
| github.com/react/react/commit/3d06b4005ac0cf9dec37267f26174adfe6d83611 | [email protected] | github.com | |
| github.com/react/react/pull/37845 | [email protected] | github.com | |
| github.com/react/react/releases/tag/v19.2.9 | [email protected] | github.com | |
| github.com/react/react/pull/37846 | [email protected] | github.com | |
| github.com/react/react/commit/611d9217df39cf7b8ac91b2e41fd00555923e904 | [email protected] | github.com | |
| github.com/react/react/pull/37842 | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.