CVE-2025-25200: Inefficient Regular Expression Complexity in koa
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.
References
- github.com/advisories/GHSA-593f-38f6-jp5m
- github.com/koajs/koa
- github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c
- github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32
- github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08
- github.com/koajs/koa/releases/tag/2.15.4
- github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m
- nvd.nist.gov/vuln/detail/CVE-2025-25200
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