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CVE-2025-61686— React Router has Path Traversal in File Session Storage

CVSS 9.1 · Critical EPSS 0.03% · P8
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I. Basic Information for CVE-2025-61686

Vulnerability Information
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Vulnerability Title
React Router has Path Traversal in File Session Storage
Source: NVD (National Vulnerability Database)
Vulnerability Description
React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used from @react-router/node (or @remix-run/node/@remix-run/deno in Remix v2) with an unsigned cookie, it is possible for an attacker to cause the session to try to read/write from a location outside the specified session file directory. The success of the attack would depend on the permissions of the web server process to access those files. Read files cannot be returned directly to the attacker. Session file reads would only succeed if the file matched the expected session file format. If the file matched the session file format, the data would be populated into the server side session but not directly returned to the attacker unless the application logic returned specific session information. This issue has been patched in @react-router/node version 7.9.4, @remix-run/deno version 2.17.2, and @remix-run/node version 2.17.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
react-router 路径遍历漏洞
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存在路径遍历漏洞，该漏洞源于使用未签名cookie时，会话可能尝试从指定会话文件目录之外的位置读取或写入。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
remix-runreact-router @react-router/node >= 7.0.0, < 7.9.4 -

II. Public POCs for CVE-2025-61686

#POC DescriptionSource LinkShenlong Link
1CVE-2025-61686复现的dockerfile与pochttps://github.com/FlowerWitch/CVE-2025-61686_dockerPOC Details
2Nonehttps://github.com/Kai-One001/React-Router-CVE-2025-61686-POC Details
3React Router's createFileSessionStorage() in certain versions allows unsigned cookies to be manipulated, enabling file system access outside the session directory.https://github.com/boroeurnprach/CVE-2025-61686-PoCPOC Details
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III. Intelligence Information for CVE-2025-61686

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Same Patch Batch · remix-run · 2026-01-10 · 6 CVEs total

CVE-2026-218848.2 HIGHReact Router SSR XSS in ScrollRestoration
CVE-2026-220298.0 HIGHReact Router vulnerable to XSS via Open Redirects
CVE-2025-590577.6 HIGHReact Router has XSS Vulnerability
CVE-2026-220306.5 MEDIUMReact Router has CSRF issue in Action/Server Action Request Processing
CVE-2025-684706.5 MEDIUMReact Router has unexpected external redirect via untrusted paths

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-22

V. Comments for CVE-2025-61686

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