GHSA-593f-38f6-jp5m
Inefficient Regular Expression Complexity in koa
At a glance
- Published
- Updated
- CVE
- CVE-2025-25200
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Description
### Summary 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. ### PoC Coming soon. ### Impact This is a Regex Denial-of-Service attack and causes memory exhaustion. The regex should be improved and empty values should not be allowed.
Affected packages
| Package | Versions |
|---|---|
| npm · koa | introduced 2.0.0, fixed 2.15.4 |
| npm · koa | introduced 3.0.0-alpha.0, fixed 3.0.0-alpha.3 |
| npm · koa | introduced 1.0.0, fixed 1.7.1 |
| npm · koa | introduced 0, fixed 0.21.2 |
References
- https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m WEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-25200 ADVISORY
- https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c WEB
- https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32 WEB
- https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08 WEB
- https://github.com/koajs/koa PACKAGE
- https://github.com/koajs/koa/releases/tag/2.15.4 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |