Skip to content
fr Sign in
4.3 Medium

CVE-2025-62595 Koa is expressive middleware for Node.js using ES2017 async functions

Description

Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.

Affected products and versions

Product Affected versions Fixed in
koa 3.0 3.0.1 → < 3.0.3 3.0.3
koa 2.16 2.16.2 → < 2.16.3 2.16.3

References

Timeline

  1. Published
  2. Last modified

Other CVEs of koa

The 5 CVEs of koa →
CVE-2026-27959 Koa is middleware for Node.js using ES2017 async functions 7.5 High CVE-2025-8129 A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0 5.1 Medium CVE-2025-32379 Koa is expressive middleware for Node.js using ES2017 async functions 5.0 Medium CVE-2025-25200 Koa is expressive middleware for Node.js using ES2017 async functions 9.2 Critical
Track this CVE