CVE-2026-39822

{
  "id": "CVE-2026-39822",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-08T17:17:21.310",
  "lastModified": "2026-10-25T17:10:00.197",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open(\"symlink/\")' will open \"symlink\" even when \"symlink\" is a symbolic link pointing outside of the root."
    },
    {
      "lang": "es",
      "value": "En sistemas Unix, abrir un archivo en un os.Root sigue incorrectamente los enlaces simbólicos a ubicaciones fuera del Root cuando el componente final de una ruta es un enlace simbólico y la ruta termina en /. Por ejemplo, ’root.Open(“symlink/”)’ abrirá “symlink” incluso cuando “symlink” es un enlace simbólico que apunta fuera de la raíz."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Go standard library",
          "product": "os",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "os",
          "programRoutines": [
            {
              "name": "rootOpenFileNolog"
            },
            {
              "name": "openRootInRoot"
            },
            {
              "name": "OpenInRoot"
            },
            {
              "name": "Root.Create"
            },
            {
              "name": "Root.Open"
            },
            {
              "name": "Root.OpenFile"
            },
            {
              "name": "Root.OpenRoot"
            },
            {
              "name": "Root.ReadFile"
            },
            {
              "name": "Root.WriteFile"
            },
            {
              "name": "rootFS.Open"
            },
            {
              "name": "rootFS.ReadDir"
            },
            {
              "name": "rootFS.ReadFile"
            }
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "1.25.12",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "1.26.0-0",
              "lessThan": "1.26.5",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "1.27.0-0",
              "lessThan": "1.27.0-rc.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-08T18:06:16.360721Z",
          "id": "CVE-2026-39822",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-61"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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  "references": [
    {
      "url": "https://go.dev/cl/797880",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://go.dev/issue/79005",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-4970",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}