Nuxt: Unauthenticated CPU exhaustion parsing and hashing the Nuxt island endpoint body before hash validation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-407.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| nuxt | nuxt | 4.0.0 to before 4.5.1; 3.1.0 to before 3.21.10 | 4.5.1, 3.21.10 | Patch available | CNA |
| — | nuxt (npm) | 4.0.0 to before 4.5.1 | 4.5.1 | Patch available | GHSA-9pgf-384g-p7mv |
| — | nuxt (npm) | 3.1.0 to before 3.21.10 | 3.21.10 | Patch available | GHSA-9pgf-384g-p7mv |
- nuxt Vendornuxt Affected 4.0.0 to before 4.5.1; 3.1.0 to before 3.21.10 Fixed in 4.5.1, 3.21.10 Patch available CNA
- nuxt (npm) Vendor— Affected 4.0.0 to before 4.5.1 Fixed in 4.5.1 Patch available GHSA-9pgf-384g-p7mv
- nuxt (npm) Vendor— Affected 3.1.0 to before 3.21.10 Fixed in 3.21.10 Patch available GHSA-9pgf-384g-p7mv
Remediation
- Fix · CNA nuxt (nuxt) Fixed in 4.5.1, 3.21.10
- Fix · GHSA-9pgf-384g-p7mv nuxt (npm) Fixed in 4.5.1 Advisory →
- Fix · GHSA-9pgf-384g-p7mv nuxt (npm) Fixed in 3.21.10 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-71321
- 2026-10-03 Alias added: GHSA-9pgf-384g-p7mv
References
Other 6
- https://github.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv
- https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e
- https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22
- https://github.com/nuxt/nuxt/releases/tag/v3.21.10
- https://github.com/nuxt/nuxt/releases/tag/v4.5.1
- https://github.com/nuxt/nuxt
More nuxt vulnerabilities
- TI-2023-03020 Code Injection in nuxt/nuxt CVSS 3.1CRITICAL 9.8
- TI-2024-28339 Server-Side Request Forgery (SSRF) in nuxt-icon CVSS 3.1HIGH 8.6
- TI-2024-22685 Remote code execution via the browser when running the test locally in nuxt CVSS 3.1HIGH 8.8
- TI-2026-26689 Nuxt OG Image vulnerable to DoS via image generation CVSS 4.0MEDIUM 6.9
- TI-2022-04037 Cross-site Scripting (XSS) - DOM in nuxt/framework CVSS 3.1MEDIUM 6.1
- TI-2022-04036 Cross-site Scripting (XSS) - Reflected in nuxt/framework CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-71321 · CVE Program
- CVE-2026-71321 · NVD
- FIRST EPSS
- GHSA-9pgf-384g-p7mv · GitHub Advisory Database · CC BY 4.0
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