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CVE-2026-42342— React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

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.

AuthKit React Router Library是WorkOS开源的一个在React Router 7中使用的身份验证和会话助手。 AuthKit React Router Library 7.0.0版本至7.14.x版本和@remix-run/server-runtime 2.10.0版本至2.17.4版本存在资源管理错误漏洞，该漏洞源于__manifest端点中无界路径扩展导致服务器资源消耗不成比例，可能导致响应时间下降或服务不可用。

CVSS 7.5 · High EPSS 0.30% · P23

Affected Version Matrix 2

VendorProduct Version RangeStatus
remix-run @remix-run/server-runtime >= 2.10.0, < 2.17.5 affected
remix-run react-router >= 7.0.0, < 7.15.0 affected
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I. Basic Information for CVE-2026-42342

Vulnerability Information
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Vulnerability Title
React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
AuthKit React Router Library 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AuthKit React Router Library是WorkOS开源的一个在React Router 7中使用的身份验证和会话助手。 AuthKit React Router Library 7.0.0版本至7.14.x版本和@remix-run/server-runtime 2.10.0版本至2.17.4版本存在资源管理错误漏洞，该漏洞源于__manifest端点中无界路径扩展导致服务器资源消耗不成比例，可能导致响应时间下降或服务不可用。
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, < 7.15.0 -
remix-run @remix-run/server-runtime >= 2.10.0, < 2.17.5 -

II. Public POCs for CVE-2026-42342

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7837 chars
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III. Intelligence Information for CVE-2026-42342

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Vendor Advisories for CVE-2026-42342 (1)

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

CVE-2026-42211 8.1 HIGH React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_E
CVE-2026-33245 8.0 HIGH React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect
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-400

V. Comments for CVE-2026-42342

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