Security advisory

{
  "id": "dd5972f0d4ab9fe3725aa28d74e5a82bc3daaf51f65a801ddec69f80f5768d69",
  "url": "https://osv.dev/vulnerability/CVE-2021-22964",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-22964",
    "summary": "A redirect vulnerability in the `fastify-static` module version >= 4.2.4 and < 4.4.1 allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`.A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is \"http://localhost:3000//^/..\"`The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`.",
    "evidence": "osv:CVE-2021-22964",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-22964",
      "aliases": [
        "CVE-2021-22964",
        "GHSA-pgh6-m65r-2rhq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fastify/fastify-static",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d97b2cf6a0353e784ad2674aaecd6508ac74130d"
                },
                {
                  "fixed": "f324f8b5013a130885c4857aad50afa113f21eae"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.4"
                      },
                      {
                        "fixed": "4.4.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.4.0",
            "v4.3.0",
            "v4.2.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22964.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:55.949588904Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/1361804"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-22964",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438553,
  "published_at": "2021-10-14T15:15:08.933+00:00"
}