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CVE-2026-42211— React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE

Quick assessment

Affected
remix-run react-router
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

react-router是Remix开源的一个 React 的声明式路由。 react-router 7.0.0版本至7.14.1版本存在代码问题漏洞，该漏洞源于框架模式下通过外部请求可能利用现有原型污染漏洞实现未经授权的远程代码执行。

CVSS 8.1 · High EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
remix-run react-router >= 7.0.0, < 7.14.2 affected
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I. Basic Information for CVE-2026-42211

Vulnerability Information
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Vulnerability Title
React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.14.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
react-router 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
react-router是Remix开源的一个 React 的声明式路由。 react-router 7.0.0版本至7.14.1版本存在代码问题漏洞，该漏洞源于框架模式下通过外部请求可能利用现有原型污染漏洞实现未经授权的远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
remix-run react-router >= 7.0.0, < 7.14.2 -

II. Public POCs for CVE-2026-42211

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8246 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-42211

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Vendor Advisories for CVE-2026-42211 (1)

Same Patch Batch · remix-run · 2026-06-02 · 6 CVEs total

CVE-2026-33245 8.0 HIGH React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect
CVE-2026-42342 7.5 HIGH React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
CVE-2026-34077 7.5 HIGH React Router vulnerable to Denial of Service via reflected user input in single-fetch
CVE-2026-40181 6.6 MEDIUM React Router's same-origin redirect with path starting // causes open redirect via protoco
CVE-2026-33244 5.4 MEDIUM React Router has stored XSS via unescaped Location header in prerendered redirect HTML

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-502

V. Comments for CVE-2026-42211

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