CVE-2026-12539

{
  "id": "CVE-2026-12539",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-18T14:17:22.510",
  "lastModified": "2026-10-26T11:10:00.157",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Docker Sandboxes (sbx) blocks ICMP egress with an authorizer applied only at network-creation time, and does not re-apply it to networks rebuilt from disk when the Docker daemon restarts, so a restart-surviving sandbox forwards ICMP to arbitrary hosts. A workload inside a sandbox, which the threat model treats as untrusted, can therefore defeat the documented ICMP egress block to perform network reconnaissance and exfiltrate data over an ICMP covert channel, regardless of the configured allowlist."
    },
    {
      "lang": "es",
      "value": "Docker Sandboxes (sbx) bloquea la salida ICMP con un autorizador aplicado solo en el momento de la creación de la red, y no lo vuelve a aplicar a las redes reconstruidas desde el disco cuando el demonio de Docker se reinicia, por lo que un sandbox que sobrevive a un reinicio reenvía ICMP a hosts arbitrarios. Una carga de trabajo dentro de un sandbox, que el modelo de amenaza trata como no confiable, puede, por lo tanto, eludir el bloqueo de salida ICMP documentado para realizar reconocimiento de red y exfiltrar datos a través de un canal encubierto ICMP, independientemente de la lista de permitidos configurada."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Docker",
          "product": "Docker Sandboxes",
          "defaultStatus": "unaffected",
          "cpes": [
            "cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "MacOS",
            "Linux",
            "Windows"
          ],
          "versions": [
            {
              "version": "0.14.0",
              "lessThan": "0.33.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 5.7,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-18T14:54:40.780021Z",
          "id": "CVE-2026-12539",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-665"
        },
        {
          "lang": "en",
          "value": "CWE-923"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://docs.docker.com/ai/sandboxes/",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/docker/sbx-releases/releases/tag/v0.33.0",
      "source": "[email protected]"
    }
  ]
}