CVE-2025-25200
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Koa has Inefficient Regular Expression Complexity
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
koa
- Vendor
- koajs
- Product
- koa
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| < 0.21.2 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 1.0.0, < 1.7.1 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 2.0.0-alpha.1, < 2.15.4 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 3.0.0-alpha.0, < < 3.0.0-alpha.3 | affected | Unavailable | Unavailable | Unavailable | None listed |