Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism

{
  "id": "0bb24087e17710e300b2ab515957d93bdc740c3cfa32e7456a1f861499beefdd",
  "url": "https://osv.dev/vulnerability/CVE-2025-23221",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism",
    "summary": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. This vulnerability allows a user to maneuver the Webfinger mechanism to perform a GET request to any internal resource on any Host, Port, URL combination regardless of present security mechanisms, and forcing the victim’s server into an infinite loop causing Denial of Service. Moreover, this issue can also be maneuvered into performing a Blind SSRF attack. This vulnerability is fixed in 1.0.14, 1.1.11, 1.2.11, and 1.3.4.",
    "evidence": "osv:CVE-2025-23221",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-23221",
      "aliases": [
        "CVE-2025-23221",
        "GHSA-c59p-wq67-24wx"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fedify-dev/fedify",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "fbfe4e13d83ef29a2c3c84f761eefe1ac4d41f1a"
                },
                {
                  "introduced": "2007d391d94f7cca657a9c8ddfd6658944e53014"
                },
                {
                  "fixed": "e06d8732d0f9a9a61f8b9578b3fb98e8ee0fd711"
                },
                {
                  "introduced": "2e639046343bb81f47b3f7a571aaec6812f4168e"
                },
                {
                  "fixed": "d47268b1a1a2297ee323da13eccbe707c5c9dc55"
                },
                {
                  "introduced": "6979c1db404bb7032e1bc18af3118318c6f66c6d"
                },
                {
                  "fixed": "91bd1d7e9a212d3b6733d7eb0c45d7aa7b64d279"
                },
                {
                  "fixed": "8be3c2038eebf4ae12481683a1e809b314be3151"
                },
                {
                  "fixed": "c505eb82fcd6b5b17174c6659c29721bc801ab9a"
                },
                {
                  "fixed": "e921134dd5097586e4563ea80b9e8d1b5460a645"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.14"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.1.0"
                      },
                      {
                        "fixed": "1.1.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.2.0"
                      },
                      {
                        "fixed": "1.2.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "fixed": "1.3.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8be3c2038eebf4ae12481683a1e809b314be3151"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c505eb82fcd6b5b17174c6659c29721bc801ab9a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e921134dd5097586e4563ea80b9e8d1b5460a645"
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                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.3",
            "1.3.2",
            "1.2.10",
            "1.1.10",
            "1.0.13",
            "1.3.1",
            "1.2.9",
            "1.3.0",
            "1.1.9",
            "1.0.12",
            "1.2.8",
            "1.1.8",
            "1.2.7",
            "1.1.7",
            "1.0.11",
            "1.2.6",
            "1.1.6",
            "1.0.10",
            "1.2.5",
            "1.1.5",
            "1.0.9",
            "1.2.4",
            "1.1.4",
            "1.0.8",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.3",
            "1.0.7",
            "1.1.2",
            "1.0.6",
            "1.1.1",
            "1.0.5",
            "1.1.0",
            "1.0.4",
            "1.0.3",
            "1.0.2",
            "1.0.1",
            "1.0.0",
            "0.15.0",
            "0.14.0",
            "0.13.0",
            "0.12.0",
            "0.11.0",
            "0.10.0",
            "0.9.0",
            "0.8.0",
            "0.7.0",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.0",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-23221.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.656776212Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/23xxx/CVE-2025-23221.json",
        "https://github.com/dahlia/fedify/security/advisories/GHSA-c59p-wq67-24wx",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-23221",
        "https://github.com/dahlia/fedify/commit/8be3c2038eebf4ae12481683a1e809b314be3151",
        "https://github.com/dahlia/fedify/commit/c505eb82fcd6b5b17174c6659c29721bc801ab9a",
        "https://github.com/dahlia/fedify/commit/e921134dd5097586e4563ea80b9e8d1b5460a645"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-835",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/23xxx/CVE-2025-23221.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-23221",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514628,
  "published_at": "2025-01-20T16:49:31.738+00:00"
}