{
  "cveId": "CVE-2026-56857",
  "url": "https://patchblox.com/security/cve/CVE-2026-56857",
  "summary": "CVE-2026-56857 is fixed in 4 products on 2 platforms, first by Go Programming Language 1.27.3, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os",
  "description": "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).",
  "published": "2026-10-08T23:17:01Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cwe": "Insecure Operation on Windows Junction / Mount Point",
  "epss": 0.00553,
  "epssPercentile": 0.46472,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56857",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Go Programming Language",
      "fixedVersion": "1.27.3",
      "fix": "Go Programming Language 1.27.3",
      "url": "https://patchblox.com/security/fix/windows-app/golang.go-1.27.3",
      "released": "2026-10-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.26.9-160000.1.1",
      "fix": "OPENSUSE-SU-2026:22095-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22095-1",
      "released": "2026-11-07T00:48:28Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 15.6",
      "fixedVersion": "1.26.9-150000.1.33.1",
      "fix": "SUSE-SU-2026:4629-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4629-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 15.7",
      "fixedVersion": "1.26.9-150000.1.33.1",
      "fix": "SUSE-SU-2026:4629-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4629-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "go1.26",
      "release": "sles 16.0",
      "fixedVersion": "1.26.9-160000.1.1",
      "fix": "SUSE-SU-2026:24239-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24239-1",
      "released": "2026-11-07T00:45:20Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "sles 15.6",
      "fixedVersion": "1.26.10-150600.13.18.1",
      "fix": "SUSE-SU-2026:4866-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4866-1",
      "released": "2026-11-07T00:42:08Z"
    },
    {
      "platform": "linux",
      "product": "go1.26-openssl",
      "release": "sles 15.7",
      "fixedVersion": "1.26.10-150600.13.18.1",
      "fix": "SUSE-SU-2026:4866-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4866-1",
      "released": "2026-11-07T00:42:08Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.27.2-160000.1.1",
      "fix": "OPENSUSE-SU-2026:22093-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22093-1",
      "released": "2026-11-07T00:48:28Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "sles 15.6",
      "fixedVersion": "1.27.2-150000.1.12.1",
      "fix": "SUSE-SU-2026:4625-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4625-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "sles 15.7",
      "fixedVersion": "1.27.2-150000.1.12.1",
      "fix": "SUSE-SU-2026:4625-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4625-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "go1.27",
      "release": "sles 16.0",
      "fixedVersion": "1.27.2-160000.1.1",
      "fix": "SUSE-SU-2026:24237-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24237-1",
      "released": "2026-11-07T00:45:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}