CVE-2026-64641

HIGH

Next.js: Denial of Service in App Router using Server Actions

Title source: cna
STIX 2.1

Description

Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. This issue has been fixed in versions 15.5.21 and 16.2.11.

References (5)

Core 5

Scores

CVSS v4 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-834
Status published
Products (2)
vercel/next.js >= 13.0.0, < 15.5.21
vercel/next.js >= 16.0.0, < 16.2.11
Published Jul 27, 2026
Tracked Since Jul 28, 2026