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CVE-2025-43864— React Router allows a DoS via cache poisoning by forcing SPA mode

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 7.2.0至7.5.2之前版本存在安全漏洞，该漏洞源于通过添加请求标头可能强制应用切换到SPA模式，可能导致缓存投毒。

CVSS 7.5 · High EPSS 20.21% · P97
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I. Basic Information for CVE-2025-43864

Vulnerability Information
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Vulnerability Title
React Router allows a DoS via cache poisoning by forcing SPA mode
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.
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
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
react-router 安全漏洞
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 7.2.0至7.5.2之前版本存在安全漏洞，该漏洞源于通过添加请求标头可能强制应用切换到SPA模式，可能导致缓存投毒。
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 >= 7.2.0, < 7.5.2 -

II. Public POCs for CVE-2025-43864

# POC Description Source Link Shenlong Link
1 None https://github.com/pouriam23/DoS-via-cache-poisoning-by-forcing-SPA-mode-CVE-2025-43864- POC Details
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7067 chars
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III. Intelligence Information for CVE-2025-43864

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Patches & Fixes for CVE-2025-43864 (2)

Vendor Advisories for CVE-2025-43864 (1)

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-755

V. Comments for CVE-2025-43864

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