Update dependency koa to v2.16.2 [SECURITY] #41

renovate · 2025-07-28T21:57:02Z

This PR contains the following updates:

Package	Change	Age	Confidence
koa (source)	`2.13.4` -> `2.16.2`

GitHub Vulnerability Alerts

CVE-2025-25200

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.

CVE-2025-32379

Summary

In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it, may execute javascript code on the user who use the app.

Patches

This issue is patched in 2.16.1 and 3.0.0-alpha.5.

PoC

Coming soon...

Impact

Redirect user to another phishing site
Make request to another endpoint of the application based on user's cookie
Steal user's cookie

CVE-2025-8129

Summary

In the latest version of Koa, the back method used for redirect operations adopts an insecure implementation, which uses the user-controllable referrer header as the redirect target.

Details

on the API document https://www.koajs.net/api/response#responseredirecturl-alt, we can see:

response.redirect(url, [alt])

Performs a [302] redirect to url.
The string "back" is specially provided for Referrer support, using alt or "/" when Referrer does not exist.

ctx.redirect('back');
ctx.redirect('back', '/index.html');
ctx.redirect('/login');
ctx.redirect('http://google.com');

however, the "back" method is insecure:

https://github.com/koajs/koa/blob/master/lib/response.js#L322

  back (alt) {
    const url = this.ctx.get('Referrer') || alt || '/'
    this.redirect(url)
  },

Referrer Header is User-Controlled.

PoC

there is a demo for POC:

const Koa = require('koa')
const serve = require('koa-static')
const Router = require('@&#8203;koa/router')
const path = require('path')

const app = new Koa()
const router = new Router()

// Serve static files from the public directory
app.use(serve(path.join(__dirname, 'public')))

// Define routes
router.get('/test', ctx => {
  ctx.redirect('back', '/index1.html')
})

router.get('/test2', ctx => {
  ctx.redirect('back')
})

router.get('/', ctx => {
  ctx.body = 'Welcome to the home page! Try accessing /test, /test2'
})

app.use(router.routes())
app.use(router.allowedMethods())

const port = 3000
app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`)
})

Proof Of Concept

GET /test HTTP/1.1
Host: 127.0.0.1:3000
Referer: http://www.baidu.com
Connection: close

GET /test2 HTTP/1.1
Host: 127.0.0.1:3000
Referer: http://www.baidu.com
Connection: close

Impact

https://learn.snyk.io/lesson/open-redirect/

Release Notes

koajs/koa (koa)

`v2.16.2`

Compare Source

What's Changed

fix: only allow back redirect to the same origin referer by @fengmk2 in #1898

Full Changelog: koajs/koa@v2.16.1...v2.16.2

`v2.16.1`

Compare Source

fix: don't render redirect values in anchor ref

`v2.16.0`

Compare Source

This is a backported release to fix core underlying issue with HEAD requests when using http2.createSecureServer. See discussion at #1593 and #1547.

fix missing cleanup, if response socket is no longer writeable (issue 1547) (#1593) 399cb6b

`v2.15.4`

Compare Source

Full Changelog: koajs/koa@2.15.3...2.15.4

Fix: avoid redos on host and protocol getter, see GHSA-593f-38f6-jp5m

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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renovate · 2025-07-28T21:57:03Z

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

any of the package files in this branch needs updating, or
the branch becomes conflicted, or
you click the rebase/retry checkbox if found above, or
you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pnpm-lock.yaml

Scope: all 3 workspace projects
 WARN  GET https://registry.npmjs.org/nextjs-koa-api error (ERR_INVALID_THIS). Will retry in 10 seconds. 2 retries left.
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Update dependency koa to v3 [SECURITY]

c5b2cf5

renovate bot added the dependencies label Jul 28, 2025

renovate bot changed the title ~~Update dependency koa to v3 [SECURITY]~~ Update dependency koa to v2.16.2 [SECURITY] Jul 30, 2025

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Update dependency koa to v2.16.2 [SECURITY] #41

Update dependency koa to v2.16.2 [SECURITY] #41

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Update dependency koa to v2.16.2 [SECURITY] #41

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Update dependency koa to v2.16.2 [SECURITY] #41

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GitHub Vulnerability Alerts

Summary

PoC

Impact

Summary

Patches

PoC

Impact

Summary

Details

PoC

Impact

Release Notes

What's Changed

Configuration

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⚠️ Artifact update problem

File name: pnpm-lock.yaml

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