Vulnerability-Lookup

CVE-2026-112947 (GCVE-0-2026-112947)

Vulnerability from cvelistv5 – Published: 2026-10-20 15:10 – Updated: 2026-10-21 15:54

Title

Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`

Summary

Vite is a frontend tooling framework for JavaScript. From 8.2.0 until 8.2.4 and 8.3.3, the first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance. Requests containing the ?vite-wasm-instance query are handled by the internal Wasm plugin's load hook. The hook removes the query and reads the resulting path directly from disk, but the server.fs checks were not applied. After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file. This vulnerability is fixed in 8.2.4 and 8.3.3.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-21 14:24 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-209 - Generation of Error Message Containing Sensitive Information

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7793 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/vitejs/vite/security/advisorie…	x_refsource_CONFIRM
https://github.com/vitejs/vite/pull/23655	x_refsource_MISC
https://github.com/vitejs/vite/commit/b6c6d2fb3f8…	x_refsource_MISC
https://github.com/vitejs/vite/commit/ba8b7ab43b4…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
vitejs	vite	Affected: >= 8.3.0, < 8.3.3 Affected: >= 8.2.0, < 8.2.4	guessed
vitejs	vite-plus	Affected: >= 0.2.8, < 1.1.0	guessed

Show details on NVD website

JSON

To clipboard

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}

BREW-VITE-CVE-2026-112947 (GHSA-VFPM-58RQ-9QCG)

Vulnerability from osv_homebrew – Published: 2026-10-22 11:18 – Updated: 2026-10-23 10:23 – Source website

Summary

Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`

Details

Summary

The first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance.

Impact

Only apps that match one of the following conditions are affected:

explicitly expose the Vite dev server to the network using --host or the server.host option
there's a file that has a sensitive information in the first 4 bytes
uses Node.js or Deno to run Vite (if Bun is used, it is not affected)

Details

Requests containing the ?vite-wasm-instance query are handled by the internal Wasm plugin's load hook. The hook removes the query and reads the resulting path directly from disk, but the server.fs checks were not applied.

After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file.

PoC

Create a denied file and start an affected Vite dev server:

echo 'SECRET_KEY=abc123\n' > .env
npm run dev
curl 'http://localhost:5173/.env?vite-wasm-instance'

This will show

Failed to parse WASM file "<root>/.env": WebAssembly.compile(): expected magic word 00 61 73 6d, found 53 45 43 52 @+0

Severity

6.3 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

URL

Type

	https://github.com/vitejs/vite/security/advisorie…	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-112947	ADVISORY
	https://github.com/vitejs/vite/pull/23655	WEB
	https://github.com/vitejs/vite/commit/b6c6d2fb3f8…	WEB
	https://github.com/vitejs/vite/commit/ba8b7ab43b4…	WEB
	https://github.com/vitejs/vite	PACKAGE

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "8.3.3"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "vite",
        "purl": "pkg:brew/vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.2.0"
            },
            {
              "fixed": "8.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "npm",
        "key": "pkg:npm/vite@8.3.5",
        "name": "vite",
        "strategy": "registry",
        "subject_version": "8.3.5"
      }
    ]
  },
  "details": "### Summary\n\nThe first 4 bytes of files outside of `server.fs` setting can be returned to the browser by a request containing `?vite-wasm-instance`.\n\n### Impact\n\n Only apps that match one of the following conditions are affected:\n\n- explicitly expose the Vite dev server to the network using `--host` or the [`server.host`](https://vite.dev/config/server-options#server-host) option\n- there\u0027s a file that has a sensitive information in **the first 4 bytes**\n- uses Node.js or Deno to run Vite (if Bun is used, it is not affected)\n\n### Details\nRequests containing the `?vite-wasm-instance` query are handled by the internal Wasm plugin\u0027s `load` hook. The hook removes the query and reads the resulting path directly from disk, but the `server.fs` checks were not applied.\n\nAfter reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file.\n\n### PoC\n\nCreate a denied file and start an affected Vite dev server:\n\n```bash\necho \u0027SECRET_KEY=abc123\\n\u0027 \u003e .env\nnpm run dev\ncurl \u0027http://localhost:5173/.env?vite-wasm-instance\u0027\n```\n\nThis will show\n```\nFailed to parse WASM file \"\u003croot\u003e/.env\": WebAssembly.compile(): expected magic word 00 61 73 6d, found 53 45 43 52 @+0\n```",
  "id": "BREW-vite-CVE-2026-112947",
  "modified": "2026-10-23T10:23:51Z",
  "published": "2026-10-22T11:18:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112947"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/pull/23655"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vitejs/vite"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`",
  "upstream": [
    "GHSA-vfpm-58rq-9qcg",
    "CVE-2026-112947"
  ]
}

FKIE_CVE-2026-112947

Vulnerability from fkie_nvd - Published: 2026-10-20 16:17 - Updated: 2026-10-21 16:17

Severity

6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff
	security-advisories@github.com	https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73
	security-advisories@github.com	https://github.com/vitejs/vite/pull/23655
	security-advisories@github.com	https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "vite",
          "vendor": "vitejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 8.3.0, \u003c 8.3.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.2.0, \u003c 8.2.4"
            }
          ]
        },
        {
          "product": "vite-plus",
          "vendor": "vitejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.2.8, \u003c 1.1.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vite is a frontend tooling framework for JavaScript. From 8.2.0 until 8.2.4 and 8.3.3, the first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance. Requests containing the ?vite-wasm-instance query are handled by the internal Wasm plugin\u0027s load hook. The hook removes the query and reads the resulting path directly from disk, but the server.fs checks were not applied. After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file. This vulnerability is fixed in 8.2.4 and 8.3.3."
    }
  ],
  "id": "CVE-2026-112947",
  "lastModified": "2026-10-21T16:17:15.320",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-112947",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-21T14:24:23.584105Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-20T16:17:05.370",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitejs/vite/pull/23655"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-209"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-VFPM-58RQ-9QCG

Vulnerability from github – Published: 2026-10-21 16:47 – Updated: 2026-10-21 16:47

Summary

Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`

Details

Summary

The first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance.

Impact

Only apps that match one of the following conditions are affected:

explicitly expose the Vite dev server to the network using --host or the server.host option
there's a file that has a sensitive information in the first 4 bytes
uses Node.js or Deno to run Vite (if Bun is used, it is not affected)

Details

After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file.

PoC

Create a denied file and start an affected Vite dev server:

echo 'SECRET_KEY=abc123\n' > .env
npm run dev
curl 'http://localhost:5173/.env?vite-wasm-instance'

This will show

Failed to parse WASM file "<root>/.env": WebAssembly.compile(): expected magic word 00 61 73 6d, found 53 45 43 52 @+0

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.3.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.3.0"
            },
            {
              "fixed": "8.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.2.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.2.0"
            },
            {
              "fixed": "8.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite-plus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.2.8"
            },
            {
              "fixed": "1.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-112947"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-209",
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-21T16:47:15Z",
    "nvd_published_at": "2026-10-20T16:17:05Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe first 4 bytes of files outside of `server.fs` setting can be returned to the browser by a request containing `?vite-wasm-instance`.\n\n### Impact\n\n Only apps that match one of the following conditions are affected:\n\n- explicitly expose the Vite dev server to the network using `--host` or the [`server.host`](https://vite.dev/config/server-options#server-host) option\n- there\u0027s a file that has a sensitive information in **the first 4 bytes**\n- uses Node.js or Deno to run Vite (if Bun is used, it is not affected)\n\n### Details\nRequests containing the `?vite-wasm-instance` query are handled by the internal Wasm plugin\u0027s `load` hook. The hook removes the query and reads the resulting path directly from disk, but the `server.fs` checks were not applied.\n\nAfter reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file.\n\n### PoC\n\nCreate a denied file and start an affected Vite dev server:\n\n```bash\necho \u0027SECRET_KEY=abc123\\n\u0027 \u003e .env\nnpm run dev\ncurl \u0027http://localhost:5173/.env?vite-wasm-instance\u0027\n```\n\nThis will show\n```\nFailed to parse WASM file \"\u003croot\u003e/.env\": WebAssembly.compile(): expected magic word 00 61 73 6d, found 53 45 43 52 @+0\n```",
  "id": "GHSA-vfpm-58rq-9qcg",
  "modified": "2026-10-21T16:47:15Z",
  "published": "2026-10-21T16:47:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112947"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/pull/23655"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vitejs/vite"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-112947 (GCVE-0-2026-112947)

BREW-VITE-CVE-2026-112947 (GHSA-VFPM-58RQ-9QCG)

Summary

Impact

Details

PoC

FKIE_CVE-2026-112947

GHSA-VFPM-58RQ-9QCG

Summary

Impact

Details

PoC

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour