CVE-2025-25200

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/koajs/koa/blob/master/lib/request.js#L259	Product
https://github.com/koajs/koa/blob/master/lib/request.js#L404	Product
https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c	Patch
https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32	Patch
https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08	Patch
https://github.com/koajs/koa/releases/tag/2.15.4	Release Notes
https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:koajs:koa::::::node.js::*
	cpe:2.3:a:koajs:koa::::::node.js::*
	cpe:2.3:a:koajs:koa::::::node.js::*
	cpe: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::*

History

No history.

Information

Published : 2025-02-12 18:15

Updated : 2026-01-20 14:42

NVD link : CVE-2025-25200

Mitre link : CVE-2025-25200

CVE.ORG link : CVE-2025-25200

JSON object : View

Products Affected

koajs

koa

CWE

CWE-1333

Inefficient Regular Expression Complexity

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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."}, {"lang": "es", "value": "Koa es un middleware expresivo para Node.js que utiliza funciones asincr\u00f3nicas ES2017. En versiones anteriores a las 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3, Koa utiliza una expresi\u00f3n regular maliciosa para analizar los encabezados HTTP `X-Forwarded-Proto` y `X-Forwarded-Host`. Esto se puede aprovechar para llevar a cabo un ataque de denegaci\u00f3n de servicio. Las versiones 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3 solucionan el problema."}], "lastModified": "2026-01-20T14:42:45.760", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "49E8166D-828D-483B-BA33-E837335BA933", "versionEndExcluding": "0.21.2"}, {"criteria": "cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "FF1C3340-4EC7-4087-B14E-8188AC925867", "versionEndExcluding": "1.7.1", "versionStartIncluding": "1.0.0"}, {"criteria": "cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "88256A20-54C1-455F-9BBA-19DC6292C978", "versionEndExcluding": "2.15.4", "versionStartIncluding": "2.0.0"}, {"criteria": "cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "C939FF76-3FDC-4439-8794-4DFC390B6AE5"}, {"criteria": "cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "6C0F27D9-2CCD-4CA4-BB80-3650CA1CC7D7"}, {"criteria": "cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "AC7C1D95-EC40-445D-A46D-5B52C771E9EE"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}