CVE-2026-34178

{
  "id": "CVE-2026-34178",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-09T10:16:21.820",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml in the supplied tar archive but creates the instance from backup/container/backup.yaml, a separate file in the same archive that is never checked against project restrictions. An authenticated remote attacker with instance-creation permission in a restricted project can craft a backup archive where backup.yaml carries restricted settings such as security.privileged=true or raw.lxc directives, bypassing all project restriction enforcement and allowing full host compromise."
    },
    {
      "lang": "es",
      "value": "En Canonical LXD anterior a 6.8, la ruta de importación de la copia de seguridad valida las restricciones del proyecto contra backup/index.yaml en el archivo tar suministrado pero crea la instancia a partir de backup/container/backup.yaml, un archivo separado en el mismo archivo que nunca se verifica contra las restricciones del proyecto. Un atacante remoto autenticado con permiso de creación de instancias en un proyecto restringido puede elaborar un archivo de copia de seguridad donde backup.yaml contenga configuraciones restringidas como security.privileged=true o directivas raw.lxc, eludiendo toda la aplicación de restricciones del proyecto y permitiendo el compromiso total del host."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Canonical",
          "product": "lxd",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/canonical",
          "packageName": "lxd",
          "platforms": [
            "Linux"
          ],
          "programFiles": [
            "permissions.go"
          ],
          "repo": "https://github.com/canonical/lxd",
          "versions": [
            {
              "version": "4.12.0",
              "lessThan": "5.0.7",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.1.0",
              "lessThan": "5.21.5",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.0.0",
              "lessThan": "6.8.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-09T11:54:57.626476Z",
          "id": "CVE-2026-34178",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.12",
              "versionEndIncluding": "5.0.6",
              "matchCriteriaId": "41A5CC7C-00BE-436D-957A-4636E52D0DF1"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.21.0",
              "versionEndIncluding": "5.21.4",
              "matchCriteriaId": "92A82DF4-3ED9-47E0-BDF1-DB9138EE0883"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.0",
              "versionEndIncluding": "6.7",
              "matchCriteriaId": "5C28FC63-0BE4-4B40-A87F-DF242AE33303"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/canonical/lxd/pull/17921",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    }
  ]
}