{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56857",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-09T15:35:58.663117Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-1386",
                "description": "CWE-1386 Insecure Operation on Windows Junction / Mount Point",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-09T15:36:01.712Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "os",
          "platforms": [
            "windows"
          ],
          "product": "os",
          "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"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.2",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "internal/syscall/windows",
          "platforms": [
            "windows"
          ],
          "product": "internal/syscall/windows",
          "programRoutines": [
            {
              "name": "Mkdirat"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.2",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Daniele Ballarini"
        }
      ],
      "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)."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-1386: Insecure Operation on Windows Junction / Mount Point",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-08T22:53:58.387Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "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"
        }
      ],
      "title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-56857",
    "datePublished": "2026-10-08T22:53:58.387Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-10-09T15:36:01.712Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}