CVE-2026-63294 (GCVE-0-2026-63294)

Vulnerability from cvelistv5 – Published: 2026-08-12 19:57 – Updated: 2026-08-13 12:38
VLAI
Title
Root RCE via image backup.yaml symlink
Summary
A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges.
Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 12:38 UTC
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
canonical CNA under the mitre root
CNA scorecard B 82/100 over 58 records in the last 180 days details
References
URL Tags
https://github.com/canonical/lxd/security/advisor… vdb-entryvendor-advisory
Impacted products
Vendor Product Version CPE status
Canonical LXD Affected: 4.0.0 , < 4.0.12 (semver)
Affected: 5.0.0 , < 5.0.8 (semver)
Affected: 5.21.0 , < 5.21.6 (semver)
Affected: 6.0 , < 6.10 (semver)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-63294",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T12:38:32.604341Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-13T12:38:48.134Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "LXD",
          "platforms": [
            "Linux"
          ],
          "product": "LXD",
          "repo": "https://github.com/canonical/lxd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "4.0.12",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "5.0.8",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "5.21.6",
              "status": "affected",
              "version": "5.21.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.10",
              "status": "affected",
              "version": "6.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-132",
          "descriptions": [
            {
              "lang": "en",
              "value": "Symlink Symbolic Link Execution"
            }
          ]
        },
        {
          "capecId": "CAPEC-233",
          "descriptions": [
            {
              "lang": "en",
              "value": "Privilege Escalation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59 Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-12T19:57:07.898Z",
        "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "shortName": "canonical"
      },
      "references": [
        {
          "tags": [
            "vdb-entry",
            "vendor-advisory"
          ],
          "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to LXD version 4.0.12 or later, 5.0.8 or later, or 5.12.6 or later, or 6.10 or later."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Root RCE via image backup.yaml symlink"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2026-63294",
    "datePublished": "2026-08-12T19:57:07.898Z",
    "dateReserved": "2026-07-16T09:49:29.911Z",
    "dateUpdated": "2026-08-13T12:38:48.134Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63294",
      "date": "2026-10-25",
      "epss": "0.00878",
      "percentile": "0.58791"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "packageName": "LXD",
                "platforms": [
                  "Linux"
                ],
                "product": "LXD",
                "repo": "https://github.com/canonical/lxd",
                "vendor": "Canonical",
                "versions": [
                  {
                    "lessThan": "4.0.12",
                    "status": "affected",
                    "version": "4.0.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.0.8",
                    "status": "affected",
                    "version": "5.0.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.21.6",
                    "status": "affected",
                    "version": "5.21.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.10",
                    "status": "affected",
                    "version": "6.0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@ubuntu.com"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "89DC62EE-69CD-4ACD-BB83-6A0635AC341C",
                    "versionEndExcluding": "4.0.12",
                    "versionStartIncluding": "4.0.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "59D070D6-84D2-400E-8260-EA52E5C60D37",
                    "versionEndExcluding": "5.0.8",
                    "versionStartIncluding": "5.0.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "575036D1-2B55-4043-B94A-1584E3F2DA37",
                    "versionEndExcluding": "5.21.6",
                    "versionStartIncluding": "5.1",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "374F5622-1D8F-4EF9-97E6-736C8220623B",
                    "versionEndExcluding": "6.10",
                    "versionStartIncluding": "6.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges."
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad de seguimiento de enlaces en LXD permite a un atacante lograr la ejecuci\u00f3n de comandos como root en el sistema anfitri\u00f3n. Durante la importaci\u00f3n o descompresi\u00f3n de archivos de imagen o de copia de seguridad manipulados, LXD no valida ni confina correctamente el archivo backup.yaml cuando este existe como un enlace simb\u00f3lico. Un atacante puede explotar esta falla proporcionando un archivo malicioso con un archivo backup.yaml con enlace simb\u00f3lico, lo que hace que LXD procese metadatos de configuraci\u00f3n no confinados y ejecute comandos arbitrarios con privilegios de root."
          }
        ],
        "id": "CVE-2026-63294",
        "lastModified": "2026-10-24T16:10:00.153",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.9,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.1,
              "impactScore": 6.0,
              "source": "security@ubuntu.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-63294",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T12:38:32.604341Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-12T20:17:47.187",
        "references": [
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Third Party Advisory",
              "Exploit",
              "Mitigation"
            ],
            "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "tags": [
              "Third Party Advisory",
              "Exploit",
              "Mitigation"
            ],
            "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
          }
        ],
        "sourceIdentifier": "security@ubuntu.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-59"
              }
            ],
            "source": "security@ubuntu.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-08-13T16:25:19Z",
      "cve": "CVE-2026-63294",
      "id": "CVE-2026-63294",
      "initial_release_date": "2026-08-13T16:25:19Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63294",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63294.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-63294",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-13T12:38:32.604341Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-13T12:38:43.106Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "packageName": "LXD",
              "platforms": [
                "Linux"
              ],
              "product": "LXD",
              "repo": "https://github.com/canonical/lxd",
              "vendor": "Canonical",
              "versions": [
                {
                  "lessThan": "4.0.12",
                  "status": "affected",
                  "version": "4.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.0.8",
                  "status": "affected",
                  "version": "5.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.21.6",
                  "status": "affected",
                  "version": "5.21.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.10",
                  "status": "affected",
                  "version": "6.0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-132",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "Symlink Symbolic Link Execution"
                }
              ]
            },
            {
              "capecId": "CAPEC-233",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "Privilege Escalation"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.9,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-59",
                  "description": "CWE-59 Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-12T19:57:07.898Z",
            "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
            "shortName": "canonical"
          },
          "references": [
            {
              "tags": [
                "vdb-entry",
                "vendor-advisory"
              ],
              "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Upgrade to LXD version 4.0.12 or later, 5.0.8 or later, or 5.12.6 or later, or 6.10 or later."
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Root RCE via image backup.yaml symlink"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "assignerShortName": "canonical",
        "cveId": "CVE-2026-63294",
        "datePublished": "2026-08-12T19:57:07.898Z",
        "dateReserved": "2026-07-16T09:49:29.911Z",
        "dateUpdated": "2026-08-13T12:38:48.134Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.