Vulnerability-Lookup

CVE-2026-71314 (GCVE-0-2026-71314)

Vulnerability from cvelistv5 – Published: 2026-08-05 20:58 – Updated: 2026-08-05 20:58

Title

Nuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island rendering

Summary

Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, an unauthenticated attacker can use a server island v-for prop, including vforToArray and , to trigger unbounded SSR memory allocation until MAX_VFOR_LENGTH = 100000 and crash the Nuxt process. This issue is fixed in 3.21.10 and 4.5.1.

Severity

7.5 (High)


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

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling
CWE-789 - Memory Allocation with Excessive Size Value
CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

GitHub_M

References

5 references

URL	Tags
https://github.com/nuxt/nuxt/security/advisories/…	x_refsource_CONFIRM
https://github.com/nuxt/nuxt/commit/4e35ae9babd94…	x_refsource_MISC
https://github.com/nuxt/nuxt/commit/668cdfdfda418…	x_refsource_MISC
https://github.com/nuxt/nuxt/releases/tag/v3.21.10	x_refsource_MISC
https://github.com/nuxt/nuxt/releases/tag/v4.5.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nuxt	nuxt	Affected: >= 4.0.0, < 4.5.1 Affected: >= 3.1.0, < 3.21.10

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JSON

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{
  "containers": {
    "cna": {
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        {
          "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"
            }
          ]
        }
      ],
      "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, an unauthenticated attacker can use a server island v-for prop, including vforToArray and , to trigger unbounded SSR memory allocation until MAX_VFOR_LENGTH = 100000 and crash the Nuxt process. This issue is fixed in 3.21.10 and 4.5.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-789",
              "description": "CWE-789: Memory Allocation with Excessive Size Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1284",
              "description": "CWE-1284: Improper Validation of Specified Quantity in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T20:58:50.965Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nuxt/nuxt/security/advisories/GHSA-hxcr-hm88-mpq6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nuxt/nuxt/security/advisories/GHSA-hxcr-hm88-mpq6"
        },
        {
          "name": "https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e"
        },
        {
          "name": "https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22"
        },
        {
          "name": "https://github.com/nuxt/nuxt/releases/tag/v3.21.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt/nuxt/releases/tag/v3.21.10"
        },
        {
          "name": "https://github.com/nuxt/nuxt/releases/tag/v4.5.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt/nuxt/releases/tag/v4.5.1"
        }
      ],
      "source": {
        "advisory": "GHSA-hxcr-hm88-mpq6",
        "discovery": "UNKNOWN"
      },
      "title": "Nuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island rendering"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-71314",
    "datePublished": "2026-08-05T20:58:50.965Z",
    "dateReserved": "2026-08-05T18:14:42.064Z",
    "dateUpdated": "2026-08-05T20:58:50.965Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-71314\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-05T21:16:59.150\",\"lastModified\":\"2026-08-05T21:16:59.150\",\"vulnStatus\":\"Received\",\"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, an unauthenticated attacker can use a server island v-for prop, including vforToArray and , to trigger unbounded SSR memory allocation until MAX_VFOR_LENGTH = 100000 and crash the Nuxt process. This issue is fixed in 3.21.10 and 4.5.1.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"nuxt\",\"product\":\"nuxt\",\"versions\":[{\"version\":\"\u003e= 4.0.0, \u003c 4.5.1\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.1.0, \u003c 3.21.10\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"},{\"lang\":\"en\",\"value\":\"CWE-770\"},{\"lang\":\"en\",\"value\":\"CWE-789\"},{\"lang\":\"en\",\"value\":\"CWE-1284\"}]}],\"references\":[{\"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-hxcr-hm88-mpq6\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

GHSA-HXCR-HM88-MPQ6

Vulnerability from github – Published: 2026-08-05 20:59 – Updated: 2026-08-05 20:59

Summary

Nuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island rendering

Details

Impact

An unauthenticated attacker can crash a Nuxt server that renders any island / server component containing a v-for over a prop (for example v-for="n in count" or a <slot v-for>). Because the island URL hash is a non-secret digest of the request, the attacker can compute a valid hash for arbitrary props and send the iterated prop as a large integer. The server then expands the v-for to that many nodes during SSR, allocating memory proportional to the attacker's number. Reporter figures: count=8000000 produced a 142.9 MB response; count=40000000 (and items=4000000 on a slot list) produced an out-of-memory crash of the worker from a single ~130-byte request. Both the plain v-for path (Vue's ssrRenderList) and the slot path (vforToArray) are affected.

Patches

Fixed in nuxt@4.5.1 and nuxt@3.21.10. Island/server-component v-for sources are now clamped to a maximum iteration count (MAX_VFOR_LENGTH = 100000) at the render boundary, covering the plain path, the <slot v-for> element, and the vforToArray slot-props helper. Combined with the body-size cap (GHSA-9pgf-384g-p7mv), a single island render can no longer allocate without bound regardless of which v-for path is used or whether the prop arrives as an integer or an array.

Workarounds

Avoid v-for directly over an unclamped prop in server components, or clamp the count in the component (v-for="n in Math.min(count, 1000)"). A body-size limit in front of /__nuxt_island/ only mitigates array-shaped inputs, not the integer-amplification case.

References

Bound helper: packages/nuxt/src/app/components/vfor.ts
Transform: packages/nuxt/src/components/plugins/islands-transform.ts
Slot helper: packages/nuxt/src/app/components/utils.ts (vforToArray)

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "nuxt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "nuxt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "3.21.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-71314"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284",
      "CWE-400",
      "CWE-770",
      "CWE-789"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T20:59:04Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn unauthenticated attacker can crash a Nuxt server that renders any island / server component containing a `v-for` over a prop (for example `v-for=\"n in count\"` or a `\u003cslot v-for\u003e`). Because the island URL hash is a non-secret digest of the request, the attacker can compute a valid hash for arbitrary props and send the iterated prop as a large integer. The server then expands the `v-for` to that many nodes during SSR, allocating memory proportional to the attacker\u0027s number. Reporter figures: `count=8000000` produced a 142.9 MB response; `count=40000000` (and `items=4000000` on a slot list) produced an out-of-memory crash of the worker from a single ~130-byte request. Both the plain `v-for` path (Vue\u0027s `ssrRenderList`) and the slot path (`vforToArray`) are affected.\n\n### Patches\n\nFixed in `nuxt@4.5.1` and `nuxt@3.21.10`. Island/server-component `v-for` sources are now clamped to a maximum iteration count (`MAX_VFOR_LENGTH = 100000`) at the render boundary, covering the plain path, the `\u003cslot v-for\u003e` element, and the `vforToArray` slot-props helper. Combined with the body-size cap (GHSA-9pgf-384g-p7mv), a single island render can no longer allocate without bound regardless of which `v-for` path is used or whether the prop arrives as an integer or an array.\n\n### Workarounds\n\nAvoid `v-for` directly over an unclamped prop in server components, or clamp the count in the component (`v-for=\"n in Math.min(count, 1000)\"`). A body-size limit in front of `/__nuxt_island/` only mitigates array-shaped inputs, not the integer-amplification case.\n\n### References\n\n- Bound helper: `packages/nuxt/src/app/components/vfor.ts`\n- Transform: `packages/nuxt/src/components/plugins/islands-transform.ts`\n- Slot helper: `packages/nuxt/src/app/components/utils.ts` (`vforToArray`)",
  "id": "GHSA-hxcr-hm88-mpq6",
  "modified": "2026-08-05T20:59:04Z",
  "published": "2026-08-05T20:59:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/security/advisories/GHSA-hxcr-hm88-mpq6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nuxt/nuxt"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/releases/tag/v3.21.10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/releases/tag/v4.5.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island rendering"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-71314 (GCVE-0-2026-71314)

GHSA-HXCR-HM88-MPQ6

Impact

Patches

Workarounds

References

Tags

Sightings

Nomenclature