Koa has Inefficient Regular Expression Complexity (koajs koa)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.84 % · percentile 58 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-1333 — Inefficient Regular Expression Complexity
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
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | CRITICAL 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 | GitHub_M |
| CVSS 4.0 | CRITICAL 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-593f-38f6-jp5m — Inefficient Regular Expression Complexity in koa
European references
- ENISA EUVD · EUVD-2025-4086
- GCVE · GCVE-0-2025-25200
Affected configurations (NVD CPE)
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*< 0.21.2cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*≥ 1.0.0 < 1.7.1cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*≥ 2.0.0 < 2.15.4cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*
Affected products
| Product | Versions |
|---|---|
| koajs · koa | affected < 0.21.2 ; affected >= 1.0.0, < 1.7.1 ; affected >= 2.0.0-alpha.1, < 2.15.4 ; affected >= 3.0.0-alpha.0, < < 3.0.0-alpha.3 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |