CVE-2026-44579 HIGH

CVE-2026-44579: Next.js: Denial of Service via connection exhaustion in applications using Cache Components

Vendor Vercel
Product next.js
Weakness CWE-770 · Uncontrolled resource consumption
Published May 13, 2026
Last update June 30, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 30, 2026 Record updated