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CVE-2026-55685— React Router: Unauthenticated Denial of Service via Inefficient Route Matching

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.

remix-run react-router是remix-run的路由管理库。 remix-run react-router 7.0.0版本至7.17.0版本存在资源管理错误漏洞，该漏洞源于manifest端点可以被未经身份验证的定向请求访问，导致服务器负载增加和响应时间变慢。

CVSS 8.7 · High EPSS 0.71% · P51

Affected Version Matrix 1

VendorProduct Version RangeStatus
remix-run react-router >= 7.0.0, < 7.18.0 affected
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I. Basic Information for CVE-2026-55685

Vulnerability Information
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Vulnerability Title
React Router: Unauthenticated Denial of Service via Inefficient Route Matching
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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
remix-run react-router 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
remix-run react-router是remix-run的路由管理库。 remix-run react-router 7.0.0版本至7.17.0版本存在资源管理错误漏洞，该漏洞源于manifest端点可以被未经身份验证的定向请求访问，导致服务器负载增加和响应时间变慢。
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, < 7.18.0 -

II. Public POCs for CVE-2026-55685

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7592 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-55685

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Vendor Advisories for CVE-2026-55685 (2)

Vendor Pages for CVE-2026-55685 (1)

Same Patch Batch · remix-run · 2026-07-27 · 5 CVEs total

CVE-2026-53667 6.9 MEDIUM React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Val
CVE-2026-53668 6.9 MEDIUM React Router: Open redirect can lead to XSS
CVE-2026-53666 6.1 MEDIUM React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR
CVE-2026-53669 5.1 MEDIUM React Router: Open redirect via backslash in <Link> and useNavigate (CVE-2025-68470 bypass

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-400

V. Comments for CVE-2026-55685

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