BREW-COPYPARTY-CVE-2026-70657 (CVE-2026-70657)

Vulnerability from osv_homebrew – Published: 2026-08-19 08:44 – Updated: 2026-09-21 08:48 – Source website
VLAI
Summary
Copyparty: file/dirkey confusion
Details

Copyparty is a portable file server. Prior to 1.20.17, copyparty volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key, granting read access to the containing folder. This vulnerability was only reachable if both types of keys (filekeys and dirkeys) were manually enabled in the volume flags simultaneously. This issue is fixed in version 1.20.17.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "1.20.17"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "copyparty",
        "purl": "pkg:brew/copyparty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.20.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/9001/copyparty",
        "name": "https://github.com/9001/copyparty",
        "strategy": "git",
        "subject_version": "1.20.24"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/copyparty@1.20.24",
        "name": "copyparty",
        "strategy": "registry",
        "subject_version": "1.20.24"
      }
    ]
  },
  "details": "Copyparty is a portable file server. Prior to 1.20.17, copyparty volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key, granting read access to the containing folder. This vulnerability was only reachable if both types of keys (filekeys and dirkeys) were manually enabled in the volume flags simultaneously. This issue is fixed in version 1.20.17.",
  "id": "BREW-copyparty-CVE-2026-70657",
  "modified": "2026-09-21T08:48:23Z",
  "published": "2026-08-19T08:44:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/releases/tag/v1.20.17"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/9001/copyparty/security/advisories/GHSA-x5pq-m9p8-f4vx"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70657.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70657"
    },
    {
      "type": "FIX",
      "url": "https://github.com/9001/copyparty/commit/e40755331ba9449993ff482456e6bdd2c6deb950"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Copyparty: file/dirkey confusion",
  "upstream": [
    "CVE-2026-70657",
    "GHSA-x5pq-m9p8-f4vx",
    "PYSEC-2026-3660"
  ]
}



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