data/osv/GO-2026-4970.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-4970",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-39822"
  ],
  "summary": "Root escape via symlink plus trailing slash in os",
  "details": "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 /.\n\nFor example, 'root.Open(\"symlink/\")' will open \"symlink\" even when \"symlink\" is a symbolic link pointing outside of the root.",
  "affected": [
    {
      "package": {
        "name": "stdlib",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.25.12"
            },
            {
              "introduced": "1.26.0-0"
            },
            {
              "fixed": "1.26.5"
            },
            {
              "introduced": "1.27.0-0"
            },
            {
              "fixed": "1.27.0-rc.2"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "os",
            "symbols": [
              "OpenInRoot",
              "Root.Create",
              "Root.Open",
              "Root.OpenFile",
              "Root.OpenRoot",
              "Root.ReadFile",
              "Root.WriteFile",
              "openRootInRoot",
              "rootFS.Open",
              "rootFS.ReadDir",
              "rootFS.ReadFile",
              "rootOpenFileNolog"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/79005"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"
    },
    {
      "type": "FIX",
      "url": "https://go.dev/cl/797880"
    }
  ],
  "credits": [
    {
      "name": "Mundur (https://github.com/M0nd0R)"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-4970",
    "review_status": "REVIEWED"
  }
}