Allocation of Resources Without Limits or Throttling in Next.js - CVE-2026-23869
Published: April 9, 2026 / Updated: April 17, 2026
Vulnerability identifier: #VU125546
CSH Severity: Medium
CVSS v4.0: 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/E:P/U:Green
CVE-ID: CVE-2026-23869
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: vercel
Affected software:
Next.js
Next.js
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in App Router Server Function endpoints when deserializing a specially crafted HTTP request. A remote attacker can send a specially crafted HTTP request to cause a denial of service.
The issue affects environments using the App Router.
How to mitigate CVE-2026-23869
Install security update from vendor's website.