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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

CVSS 8.1 · High

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
remix-runreact-router>= 7.0.0, < 7.14.2affected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
remix-runreact-router >= 7.0.0, < 7.14.2 -

II. Public POCs for CVE-2026-42211

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8246 chars
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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-2026-332458.0 HIGHReact Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect
CVE-2026-423427.5 HIGHReact Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
CVE-2026-340777.5 HIGHReact Router vulnerable to Denial of Service via reflected user input in single-fetch
CVE-2026-332445.4 MEDIUMReact Router has stored XSS via unescaped Location header in prerendered redirect HTML
CVE-2026-40181React Router's same-origin redirect with path starting // causes open redirect via protoco

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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