Vulnerability Description
Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Koajs | Koa | < 0.21.2 |
Related Weaknesses (CWE)
References
- https://github.com/koajs/koa/blob/master/lib/request.js#L259Product
- https://github.com/koajs/koa/blob/master/lib/request.js#L404Product
- https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83cPatch
- https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32Patch
- https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08Patch
- https://github.com/koajs/koa/releases/tag/2.15.4Release Notes
- https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5mVendor Advisory
FAQ
What is CVE-2025-25200?
CVE-2025-25200 is a vulnerability with a CVSS score of 7.5 (HIGH). Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwar...
How severe is CVE-2025-25200?
CVE-2025-25200 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-25200?
Check the references section above for vendor advisories and patch information. Affected products include: Koajs Koa.