data/cve/v5/GO-2026-6604.json

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.0",
  "cveMetadata": {
    "cveId": "CVE-2026-56857"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc"
      },
      "title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os",
      "descriptions": [
        {
          "lang": "en",
          "value": "On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target)."
        }
      ],
      "affected": [
        {
          "vendor": "Go standard library",
          "product": "os",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "os",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.26.9",
              "status": "affected",
              "versionType": "semver"
            },
            {
              "version": "1.27.0-0",
              "lessThan": "1.27.2",
              "status": "affected",
              "versionType": "semver"
            }
          ],
          "platforms": [
            "windows"
          ],
          "programRoutines": [
            {
              "name": "Root.Mkdir"
            },
            {
              "name": "doInRoot"
            },
            {
              "name": "rootMkdirAll"
            },
            {
              "name": "Root.Chmod"
            },
            {
              "name": "Root.Chown"
            },
            {
              "name": "Root.Chtimes"
            },
            {
              "name": "Root.Lchown"
            },
            {
              "name": "Root.Link"
            },
            {
              "name": "Root.MkdirAll"
            },
            {
              "name": "Root.Remove"
            },
            {
              "name": "Root.RemoveAll"
            },
            {
              "name": "Root.Rename"
            },
            {
              "name": "Root.Symlink"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Go standard library",
          "product": "internal/syscall/windows",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "internal/syscall/windows",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.26.9",
              "status": "affected",
              "versionType": "semver"
            },
            {
              "version": "1.27.0-0",
              "lessThan": "1.27.2",
              "status": "affected",
              "versionType": "semver"
            }
          ],
          "platforms": [
            "windows"
          ],
          "programRoutines": [
            {
              "name": "Mkdirat"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-1386: Insecure Operation on Windows Junction / Mount Point"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://go.dev/cl/847305"
        },
        {
          "url": "https://go.dev/issue/81739"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6604"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Daniele Ballarini"
        }
      ]
    }
  }
}