CVE-2025-25200
Fixed upstream EPSS <1%CVSS 9.2
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.
Products: koajs koa
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | koa | 2.15.4 |
| npm | koa | 3.0.0-alpha.3 |
| npm | koa | 1.7.1 |
| npm | koa | 0.21.2 |