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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-71321
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 22:17:08 UTC
Updated2026-08-05 22:17:08 UTC
DescriptionNuxt 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-407 | CWE-770 | CWE-407 CWE-407: Inefficient Algorithmic Complexity | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nuxt Nuxt affected >= 4.0.0, < 4.5.1 Not specified
CNA Nuxt Nuxt affected >= 3.1.0, < 3.21.10 Not specified

References

ReferenceSourceLinkTags
github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22 [email protected] github.com
github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e [email protected] github.com
github.com/nuxt/nuxt/releases/tag/v4.5.1 [email protected] github.com
github.com/nuxt/nuxt/releases/tag/v3.21.10 [email protected] github.com
github.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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