CVE-2025-25200
9.2
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| koajs | koa | < 0.21.2 | affected |
| koajs | koa | >= 1.0.0, < 1.7.1 | affected |
| koajs | koa | >= 2.0.0-alpha.1, < 2.15.4 | affected |
| koajs | koa | >= 3.0.0-alpha.0, < < 3.0.0-alpha.3 | affected |
Weaknesses
- CWE-1333: CWE-1333: Inefficient Regular Expression Complexity
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m
- 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/blob/master/lib/request.js#L259
- https://github.com/koajs/koa/blob/master/lib/request.js#L404
- https://github.com/koajs/koa/releases/tag/2.15.4
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