CVE-2025-25200 Information

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.

Reference

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