FKIE_CVE-2026-71321

Vulnerability from fkie_nvd - Published: 2026-08-05 22:17 - Updated: 2026-08-06 14:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
References
security-advisories@github.comhttps://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e
security-advisories@github.comhttps://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22
security-advisories@github.comhttps://github.com/nuxt/nuxt/releases/tag/v3.21.10
security-advisories@github.comhttps://github.com/nuxt/nuxt/releases/tag/v4.5.1
security-advisories@github.comhttps://github.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nuxt",
          "vendor": "nuxt",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.5.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.1.0, \u003c 3.21.10"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-71321",
  "lastModified": "2026-08-06T14:16:44.860",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-71321",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-06T13:44:48.051188Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-05T22:17:08.507",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nuxt/nuxt/releases/tag/v3.21.10"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nuxt/nuxt/releases/tag/v4.5.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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