{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66898", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-07-28T07:41:26.311Z", "datePublished": "2026-08-12T20:07:32.889Z", "dateUpdated": "2026-08-12T20:07:32.889Z"}, "containers": {"cna": {"title": "Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE", "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."}], "affected": [{"vendor": "Canonical", "product": "LXD", "packageName": "LXD", "platforms": ["Linux"], "repo": "https://github.com/canonical/lxd", "defaultStatus": "unaffected", "versions": [{"version": "4.0.0", "status": "affected", "versionType": "semver", "lessThan": "4.0.12"}, {"version": "5.0.0", "status": "affected", "versionType": "semver", "lessThan": "5.0.4"}, {"version": "5.21.0", "status": "affected", "versionType": "semver", "lessThan": "5.21.2"}, {"version": "6.0", "status": "affected", "versionType": "semver", "lessThan": "6.1"}]}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "cweId": "CWE-22"}]}], "impacts": [{"capecId": "CAPEC-126", "descriptions": [{"lang": "en", "value": "Path Traversal"}]}, {"capecId": "CAPEC-153", "descriptions": [{"lang": "en", "value": "Input Data Manipulation"}]}], "references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984", "tags": ["vdb-entry", "vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL"}}], "source": {"discovery": "EXTERNAL"}, "solutions": [{"lang": "en", "value": "Upgrade to LXD version 4.0.12 or later, 5.0.4 or later, or 5.12.2 or later, or 6.0 or later."}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-08-12T20:07:32.889Z"}}}}

{}

{"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": "5.0.4", "status": "affected", "version": "5.0.0", "versionType": "semver"}, {"lessThan": "5.21.2", "status": "affected", "version": "5.21.0", "versionType": "semver"}, {"lessThan": "6.1", "status": "affected", "version": "6.0", "versionType": "semver"}]}], "source": "security@ubuntu.com"}], "cveTags": [], "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."}], "id": "CVE-2026-66898", "lastModified": "2026-08-12T21:17:39.700", "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"}]}, "published": "2026-08-12T21:17:39.700", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{}