{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.20.19"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b331bb1c8c8cc306b91e4d94221969335a7a3e86"
            },
            {
              "fixed": "ac4be555f6cceacbbbc6d50e681a64612da90711"
            }
          ],
          "repo": "https://github.com/9001/copyparty",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-phv8-wgjp-g4p9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104102.json"
  },
  "details": "copyparty is a portable file server. Prior to 1.20.19, FTP upload path handling does not confine destinations to configured copyparty volumes. When FTP or FTPS is explicitly enabled, a low-privileged authenticated user can submit traversal paths during upload to create a new file outside configured volumes wherever the copyparty process has write permission. The attacker cannot read or overwrite files, the output name receives a randomized suffix, and copyparty does not execute the file; however, unrelated software on the same host could process the newly created file. This issue is fixed in version 1.20.19.",
  "id": "CVE-2026-104102",
  "modified": "2026-10-15T02:30:48.482382117Z",
  "published": "2026-10-12T18:32:00.821Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/releases/tag/v1.20.19"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104102.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104102"
    },
    {
      "type": "FIX",
      "url": "https://github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "copyparty FTP: upload outside defined volumes (limited path traversal)"
}