CVE-2026-71321
Nuxt: Unauthenticated CPU exhaustion parsing and hashing the Nuxt island endpoint body before hash validation
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-407 CWE-770 |
| Vendor | nuxt |
| Product | nuxt |
| Published | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
nuxt / nuxt
>= 4.0.0, < 4.5.1 >= 3.1.0, < 3.21.10
References
github.com: https://github.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv github.com: https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e github.com: https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22 github.com: https://github.com/nuxt/nuxt/releases/tag/v3.21.10 github.com: https://github.com/nuxt/nuxt/releases/tag/v4.5.1