CVE-2024-34350: Vercel Next.js

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Next.js is a React framework that can provide building blocks to create web applications. Prior to 13.5.1, an inconsistent interpretation of a crafted HTTP request meant that requests are treated as both a single request, and two separate requests by Next.js, leading to desynchronized responses. This led to a response queue poisoning vulnerability in the affected Next.js versions. For a request to be exploitable, the affected route also had to be making use of the [rewrites](https://nextjs.org/docs/app/api-reference/next-config-js/rewrites) feature in Next.js. The vulnerability is resolved in Next.js `13.5.1` and newer.

Affected products

• Vercel Next.js: from 13.4.0, before 13.5.1 (fixed in 13.5.1)

Published 2024-05-14. Last modified 2026-06-17.