Main Vulnerability Database Vulnerabilities #VU125546

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: 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-2026-23869

CWE-ID: CWE-770

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerability details

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.

Affected software

Next.js
React

How to mitigate CVE-2026-23869

Install security update from vendor's website.

Next.js - addressed in versions 15.5.15, 16.2.3
React - addressed in versions 19.0.5, 19.1.6, 19.2.5

Links to Public Exploits and PoC-codes

Exploit #12609 - CVE-2026-23869-Exploit () (April 17, 2026)

External References

https://github.com/vercel/next.js/security/advisories/GHSA-q4gf-8mx6-v5v3