CVE-2025-25200
Severity CVSS v4.0:
CRITICAL
Type:
Unavailable / Other
Publication date:
12/02/2025
Last modified:
20/01/2026
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.
Impact
Base Score 4.0
9.20
Severity 4.0
CRITICAL
Base Score 3.x
7.50
Severity 3.x
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:* | 0.21.2 (excluding) | |
| cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:* | 1.0.0 (including) | 1.7.1 (excluding) |
| cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:* | 2.0.0 (including) | 2.15.4 (excluding) |
| cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:* | ||
| cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:* | ||
| cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:* |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- https://github.com/koajs/koa/blob/master/lib/request.js#L259
- https://github.com/koajs/koa/blob/master/lib/request.js#L404
- https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c
- https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32
- https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08
- https://github.com/koajs/koa/releases/tag/2.15.4
- https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m