{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "9.1.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "85a80f11f76a0f49d7186c8e512daedcafe21153"
            },
            {
              "fixed": "48b136f5d8da0efea328f49f6202ab3edabf608b"
            }
          ],
          "repo": "https://github.com/fastify/fastify-static",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openjs",
    "cwe_ids": [
      "CWE-177"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6414.json"
  },
  "details": "@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.",
  "id": "CVE-2026-6414",
  "modified": "2026-07-08T05:37:06.622081504Z",
  "published": "2026-04-16T13:09:03.526Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6414.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6414"
    }
  ],
  "related": [
    "GHSA-x428-ghpx-8j92",
    "GHSA-cxrg-g7r8-w69p",
    "GHSA-q5qw-h33p-qvwr"
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@fastify/static vulnerable to route guard bypass via encoded path separators"
}