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EUVD-2026-5484

fkie_cve-2024-34350

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.

GHSA-77r5-gw3j-2mpf — Next.js Vulnerable to HTTP Request Smuggling

Affected: npm: next

### Impact 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.

### Patches The vulnerability is resolved in Next.js `13.5.1` and newer. This includes Next.js `14.x`.

### Workarounds There are no official workarounds for this vulnerability. We recommend that you upgrade to a safe version.

### References https://portswigger.net/web-security/request-smuggling/advanced/response-queue-poisoning