« Volver al listado

CVE-2026-66898

Estado: AnalizadaCrítica (9.9)—

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N + PR:L indica explotación de servicio remoto (LXD) con privilegios; path traversal en backup permite lectura (T1005) y sobrescritura de archivos (T1565.001) fuera del directorio designado.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Canonical — LXD

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-66898",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-66898",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-13T13:40:15.405663Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@ubuntu.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 9.9,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 3.1
      }
    ]
  },
  "affected": [
    {
      "source": "security@ubuntu.com",
      "affectedData": [
        {
          "repo": "https://github.com/canonical/lxd",
          "vendor": "Canonical",
          "product": "LXD",
          "versions": [
            {
              "status": "affected",
              "version": "4.0.0",
              "lessThan": "4.0.12",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.0.0",
              "lessThan": "5.0.4",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.21.0",
              "lessThan": "5.21.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.0",
              "lessThan": "6.1",
              "versionType": "semver"
            }
          ],
          "platforms": [
            "Linux"
          ],
          "packageName": "LXD",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-12T21:17:39.700",
  "references": [
    {
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984",
      "tags": [
        "Vendor Advisory",
        "Exploit",
        "Mitigation"
      ],
      "source": "security@ubuntu.com"
    },
    {
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984",
      "tags": [
        "Vendor Advisory",
        "Exploit",
        "Mitigation"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@ubuntu.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory."
    }
  ],
  "lastModified": "2026-09-11T15:30:05.387",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "89DC62EE-69CD-4ACD-BB83-6A0635AC341C",
              "versionEndExcluding": "4.0.12",
              "versionStartIncluding": "4.0.0"
            },
            {
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E48F1136-C506-457C-B541-6290724B2070",
              "versionEndExcluding": "5.0.4",
              "versionStartIncluding": "5.0.0"
            },
            {
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EF3D3966-CFB4-46B6-8BDA-BE54667A9482",
              "versionEndExcluding": "5.21.2",
              "versionStartIncluding": "5.1"
            },
            {
              "criteria": "cpe:2.3:a:canonical:lxd:6.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3B60D3D1-7BD2-454A-B0CF-CE30B057DD80"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@ubuntu.com"
}