Next.js: Denial of Service via connection exhaustion in applications using Cache Components
Title source: cnaExploitation Summary
EIP tracks 2 public exploits for CVE-2026-44579. PoCs published by dwisiswant0, XZ1r0.
AI-analyzed exploit summary This repository contains functional proof-of-concept exploits for multiple CVEs in Next.js v16.2.4, including detailed write-ups, vulnerable code snippets, and exploit scripts. The PoCs cover vulnerabilities such as SSRF, XSS, DoS, and cache poisoning, with runnable exploit primitives and minimal vulnerable applications for reproduction.
Description
Next.js is a React framework for building full-stack web applications. From to before 15.5.16 and 16.2.5, applications using Partial Prerendering through the Cache Components feature can be vulnerable to connection exhaustion through crafted POST requests to a server action. In affected configurations, a malicious request can trigger a request-body handling deadlock that leaves connections open for an extended period, consuming file descriptors and server capacity until legitimate users are denied service. This vulnerability is fixed in 15.5.16 and 16.2.5.
Exploits (2)
This repository contains functional proof-of-concept exploits for multiple CVEs in Next.js v16.2.4, including detailed write-ups, vulnerable code snippets, and exploit scripts. The PoCs cover vulnerabilities such as SSRF, XSS, DoS, and cache poisoning, with runnable exploit primitives and minimal vulnerable applications for reproduction.
This repository contains a functional exploit for CVE-2026-44579, a vulnerability in Next.js < 16.2.5 where the `next-resume` header is not filtered, allowing attackers to force expensive resume processing and trigger DoS or cache poisoning. The exploit includes Python and Bash scripts to demonstrate the vulnerability.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H