Resource exhaustion in Next.js - CVE-2026-44579
Published: May 6, 2026
Vulnerability identifier: #VU130276
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44579
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper request handling in the Cache Components feature when processing crafted POST requests to a server action. A remote attacker can send a specially crafted request to cause a denial of service.
Only applications using Partial Prerendering through the Cache Components feature are vulnerable. The issue can trigger a request-body handling deadlock that leaves connections open for an extended period, consuming file descriptors and server capacity.
Affected software
Next.js
How to mitigate CVE-2026-44579
Install security update from vendor's website.
Next.js - addressed in versions 15.5.16, 16.2.5