vite: `server.fs.deny` bypass on Windows alternate paths

{
  "id": "d2a3b14bb047cf1392d040223a8e7d375673ff5f8dcf06ae588e855bc6ea506b",
  "url": "https://osv.dev/vulnerability/GHSA-fx2h-pf6j-xcff",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vite: `server.fs.deny` bypass on Windows alternate paths",
    "summary": "### Summary The contents of files that are specified by [`server.fs.deny`](https://vite.dev/config/server-options#server-fs-deny) can be returned to the browser on Windows. ### Impact Only apps that match the following conditions are affected: - 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)) - the sensitive file exists in the allowed directories specified by [`server.fs.allow`](https://vite.dev/config/server-options#server-fs-allow) - either of: - the sensitive file exists in an NTFS volume - the dev server is running on Windows and the sensitive file exists in a volume that 8.3 short name generation is enabled (it is enabled by default on system volumes) ### Details Vite’s dev server denies direct access to sensitive files through `server.fs.deny`, including entries such as `.env`, `.env.*`, and `*.{crt,pem}`. However, on Windows, the deny logic does not correctly normalize NTFS ADS path forms before access checks are applied. Because of this, requests such as `/.env::$DATA?raw` are treated as allowed paths, while Windows resolves them to the original file's default data stream. Similar to that, Windows allows accessing a file using a different name with the 8.3 short name compatibility feature. Vite did not reject accessing files via them. ### PoC ```bash $ npm create vite@latest $ cd vite-project/ $ npm install $ npm run dev ``` Access via browser at `http://",
    "evidence": "osv:GHSA-fx2h-pf6j-xcff",
    "products": [
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.0.16",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.3.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.4.3",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite-plus",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.24",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-fx2h-pf6j-xcff",
      "aliases": [
        "CVE-2026-53571",
        "GHSA-fx2h-pf6j-xcff"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.0.0"
                },
                {
                  "fixed": "8.0.16"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fx2h-pf6j-xcff/GHSA-fx2h-pf6j-xcff.json",
            "last_known_affected_version_range": "<= 8.0.15"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.3.5"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fx2h-pf6j-xcff/GHSA-fx2h-pf6j-xcff.json",
            "last_known_affected_version_range": "<= 7.3.4"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.4.3"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fx2h-pf6j-xcff/GHSA-fx2h-pf6j-xcff.json",
            "last_known_affected_version_range": "<= 6.4.2"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.1.24"
                }
              ]
            }
          ],
          "package": {
            "name": "vite-plus",
            "purl": "pkg:npm/vite-plus",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fx2h-pf6j-xcff/GHSA-fx2h-pf6j-xcff.json",
            "last_known_affected_version_range": "<= 0.1.23"
          }
        }
      ],
      "modified": "2026-10-27T15:15:07.885624041Z",
      "provider": "osv",
      "references": [
        "https://github.com/vitejs/vite/security/advisories/GHSA-fx2h-pf6j-xcff",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53571",
        "https://github.com/vitejs/vite"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-22"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-06-22T18:16:44Z",
        "github_reviewed_at": "2026-06-15T17:17:45Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53571",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 462822,
  "published_at": "2026-06-15T17:17:45+00:00"
}