{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.4"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.3.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.4.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.4.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39365"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T18:03:46Z",
    "nvd_published_at": "2026-04-07T20:16:30Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nAny files ending with `.map` even out side the project can be returned to the browser.\n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- have a sensitive content in files ending with `.map` and the path is predictable\n\n### Details\n\nIn Vite v7.3.1, the dev server\u2019s handling of `.map` requests for optimized dependencies resolves file paths and calls `readFile` without restricting `../` segments in the URL. As a result, it is possible to bypass the [`server.fs.strict`](https://vite.dev/config/server-options#server-fs-strict) allow list and retrieve `.map` files located outside the project root, provided they can be parsed as valid source map JSON.\n\n### PoC\n1. Create a minimal PoC sourcemap outside the project root\n    ```bash\n    cat \u003e /tmp/poc.map \u003c\u003c\u0027EOF\u0027\n    {\"version\":3,\"file\":\"x.js\",\"sources\":[],\"names\":[],\"mappings\":\"\"}\n    EOF\n    ```\n2. Start the Vite dev server (example)\n    ```bash\n    pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080\n    ```\n3. Confirm that direct `/@fs` access is blocked by `strict` (returns 403)\n    \u003cimg width=\"4004\" height=\"1038\" alt=\"image\" src=\"https://github.com/user-attachments/assets/15a859a8-1dc6-4105-8d58-80527c0dd9ab\" /\u003e\n4. Inject `../` segments under the optimized deps `.map` URL prefix to reach `/tmp/poc.map`\n    \u003cimg width=\"2790\" height=\"846\" alt=\"image\" src=\"https://github.com/user-attachments/assets/5d02957d-2e6a-4c45-9819-3f024e0e81f2\" /\u003e",
  "id": "GHSA-4w7w-66w2-5vf9",
  "modified": "2026-04-07T22:16:27Z",
  "published": "2026-04-06T18:03:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39365"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/pull/22161"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/commit/79f002f2286c03c88c7b74c511c7f9fc6dc46694"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vitejs/vite"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/releases/tag/v6.4.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/releases/tag/v7.3.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite/releases/tag/v8.0.5"
    }
  ],
  "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 Vulnerable to Path Traversal in Optimized Deps `.map` Handling"
}