CVE-2026-85526

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-85526", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-09-04T08:34:29.842Z", "datePublished": "2026-09-28T13:21:40.621Z", "dateUpdated": "2026-09-29T03:55:18.376Z"}, "containers": {"cna": {"title": "Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD", "datePublic": "2026-09-25T03:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-22", "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-126", "descriptions": [{"lang": "en", "value": "CAPEC-126 Path Traversal"}]}], "affected": [{"vendor": "Canonical", "product": "LXD", "platforms": ["Linux"], "packageName": "LXD", "repo": "https://github.com/canonical/lxd", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.14", "versionType": "semver"}, {"status": "affected", "version": "5.0.0", "lessThan": "5.0.10", "versionType": "semver"}, {"status": "affected", "version": "5.21.0", "lessThan": "5.21.8", "versionType": "semver"}, {"status": "affected", "version": "6.0", "lessThan": "6.10", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import."}], "references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv", "tags": ["vendor-advisory", "issue-tracking"]}, {"url": "https://github.com/canonical/lxd-private/pull/87", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/105", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/104", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/103", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/84", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 9.9, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}}], "solutions": [{"lang": "en", "value": "Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later."}], "source": {"discovery": "UNKNOWN"}, "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-09-28T13:21:40.621Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-28T00:00:00+00:00", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-85526"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-29T03:55:18.376Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-85526", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-09-28T13:53:32.983935Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-28T13:53:38.667Z"}}], "cna": {"title": "Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD", "source": {"discovery": "UNKNOWN"}, "impacts": [{"capecId": "CAPEC-126", "descriptions": [{"lang": "en", "value": "CAPEC-126 Path Traversal"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/canonical/lxd", "vendor": "Canonical", "product": "LXD", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.14", "versionType": "semver"}, {"status": "affected", "version": "5.0.0", "lessThan": "5.0.10", "versionType": "semver"}, {"status": "affected", "version": "5.21.0", "lessThan": "5.21.8", "versionType": "semver"}, {"status": "affected", "version": "6.0", "lessThan": "6.10", "versionType": "semver"}], "platforms": ["Linux"], "packageName": "LXD", "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later."}], "datePublic": "2026-09-25T03:00:00.000Z", "references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv", "tags": ["vendor-advisory", "issue-tracking"]}, {"url": "https://github.com/canonical/lxd-private/pull/87", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/105", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/104", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/103", "tags": ["patch"]}, {"url": "https://github.com/canonical/lxd-private/pull/84", "tags": ["patch"]}], "descriptions": [{"lang": "en", "value": "Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-22", "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-09-28T13:21:40.621Z"}}}, "cveMetadata": {"cveId": "CVE-2026-85526", "state": "PUBLISHED", "dateUpdated": "2026-09-29T03:55:18.376Z", "dateReserved": "2026-09-04T08:34:29.842Z", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "datePublished": "2026-09-28T13:21:40.621Z", "assignerShortName": "canonical"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "LXD", "platforms": ["Linux"], "product": "LXD", "repo": "https://github.com/canonical/lxd", "vendor": "Canonical", "versions": [{"lessThan": "4.0.14", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "5.0.10", "status": "affected", "version": "5.0.0", "versionType": "semver"}, {"lessThan": "5.21.8", "status": "affected", "version": "5.21.0", "versionType": "semver"}, {"lessThan": "6.10", "status": "affected", "version": "6.0", "versionType": "semver"}]}], "source": "security@ubuntu.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import."}], "id": "CVE-2026-85526", "lastModified": "2026-09-29T04:18:00.690", "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-2026-85526", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-28T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-09-28T14:17:20.423", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd-private/pull/103"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd-private/pull/104"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd-private/pull/105"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd-private/pull/84"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd-private/pull/87"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.14)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0,5.0.10)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[5.21.0,5.21.8)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[6.0,6.10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "LXD", "source": "cna", "vendor": "Canonical"}, "product": "lxd", "vendor": "canonical"}], "created": "2026-09-28T15:00:03.805722+00:00", "updated": "2026-09-28T15:30:02.821303+00:00", "vendors": ["canonical", "canonical$PRODUCT$lxd"]}