CVE-2026-71321

HIGH

Nuxt: Unauthenticated CPU exhaustion parsing and hashing the Nuxt island endpoint body before hash validation

Title source: cna
STIX 2.1

Description

Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, the internal island renderer endpoint `/__nuxt_island/...` decodes and hashes attacker-controlled JSON body input with destr and ohash before validating the URL-resident hash. An unauthenticated `POST /__nuxt_island/_.json` with a large JSON body is fully read, parsed, hashed, and then rejected, which wastes CPU on Nitro single event loop and delays concurrent requests. No valid hash and no authentication are required. This issue is fixed in 3.21.10 and 4.5.1.

References (5)

Core 5

Scores

CVSS v3 7.5
EPSS 0.0042
EPSS Percentile 34.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-407 CWE-770
Status published
Products (4)
npm/nuxt 3.1.0 - 3.21.10npm
npm/nuxt 4.0.0 - 4.5.1npm
nuxt/nuxt >= 3.1.0, < 3.21.10
nuxt/nuxt >= 4.0.0, < 4.5.1
Published Aug 05, 2026
Tracked Since Aug 06, 2026