GHSA-f46r-rw29-r322

Suggest an improvement
Source
https://github.com/advisories/GHSA-f46r-rw29-r322
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-f46r-rw29-r322/GHSA-f46r-rw29-r322.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-f46r-rw29-r322
Aliases
Published
2025-04-24T16:31:16Z
Modified
2025-04-25T14:32:54Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
React Router allows a DoS via cache poisoning by forcing SPA mode
Details

Summary

After some research, it turns out that 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.

Details

The vulnerable header is X-React-Router-SPA-Mode; adding it to a request sent to a page/endpoint using a loader throws an error. Here is the vulnerable code :

To use the header, React-router must be used in Framework mode, and for the attack to be possible the target page must use a loader.

Steps to reproduce

Versions used for our PoC:

  • "@react-router/node": "^7.5.0",
  • "@react-router/serve": "^7.5.0",
  • "react": "^19.0.0"
  • "react-dom": "^19.0.0"
  • "react-router": "^7.5.0"
  1. Install React-Router with its default configuration in Framework mode (https://reactrouter.com/start/framework/installation)
  2. Add a simple page using a loader (example: routes/ssr)

image

  1. Send a request to the endpoint using the loader (/ssr in our case) adding the following header:
X-React-Router-SPA-Mode: yes

Notice the difference between a request with and without the header;

Normal request

With the header image

Impact

If a system cache is in place, it is possible to poison the response by completely altering its content (by an error message), strongly impacting its availability, making the latter impractical via a cache-poisoning attack.

Credits

  • Rachid Allam (zhero;)
  • Yasser Allam (inzo_)
Database specific 
{
    "cwe_ids":  [
        "CWE-755"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2025-04-24T16:31:16Z",
    "nvd_published_at":  "2025-04-25T01:15:43Z",
    "severity":  "HIGH"
}
References

Affected packages

npm / react-router

Package

Name
react-router
View open source insights on deps.dev
Purl
pkg:npm/react-router

Affected ranges

Type
SEMVER
Events
Introduced
7.2.0
Fixed
7.5.2

Database specific

last_known_affected_version_range 
"<= 7.5.1"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-f46r-rw29-r322/GHSA-f46r-rw29-r322.json"