CVE-2025-25200
EPSS 0.50%Inefficient Regular Expression Complexity in koa
Published: 2/12/2025Modified: 2/12/2025
Also known as:GHSA-593f-38f6-jp5m
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 (1)
- npm/koa>= 2.0.0, < 2.15.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-25200
- PATCHhttps://github.com/koajs/koa
- WEBhttps://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c
- WEBhttps://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32
- WEBhttps://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08
- WEBhttps://github.com/koajs/koa/releases/tag/2.15.4
- WEBhttps://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m