{"api_version":"1","generated_at":"2026-10-01T20:24:42+00:00","cve":"CVE-2026-85185","urls":{"html":"https://cve.report/CVE-2026-85185","api":"https://cve.report/api/cve/CVE-2026-85185.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-85185","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-85185"},"summary":{"title":"Path traversal in LXD btrfs storage driver allows arbitrary file deletion and write on host as root","description":"Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.","state":"PUBLISHED","assigner":"canonical","published_at":"2026-09-28 14:17:20","updated_at":"2026-09-28 17:17:51"},"problem_types":["CWE-22","CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"],"metrics":[{"version":"3.1","source":"security@ubuntu.com","type":"Secondary","score":"9.6","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","baseScore":9.6,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"9.6","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p","name":"https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p","refsource":"security@ubuntu.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85185","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85185","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Canonical","product":"LXD","version":"affected 4.0.2 4.0.14 semver","platforms":["Linux"]},{"source":"CNA","vendor":"Canonical","product":"LXD","version":"affected 5.0.0 5.0.10 semver","platforms":["Linux"]},{"source":"CNA","vendor":"Canonical","product":"LXD","version":"affected 5.21.0 5.21.8 semver","platforms":["Linux"]},{"source":"CNA","vendor":"Canonical","product":"LXD","version":"affected 6.0 6.10 semver","platforms":["Linux"]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"85185","cve":"CVE-2026-85185","epss":"0.003610000","percentile":"0.273580000","score_date":"2026-09-29","updated_at":"2026-09-30 00:11:22"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-85185","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-28T13:55:28.506443Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-28T16:32:28.529Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","packageName":"LXD","platforms":["Linux"],"product":"LXD","repo":"https://github.com/canonical/lxd","vendor":"Canonical","versions":[{"lessThan":"4.0.14","status":"affected","version":"4.0.2","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"}]}],"datePublic":"2026-09-25T03:00:00.000Z","descriptions":[{"lang":"en","value":"Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source."}],"impacts":[{"capecId":"CAPEC-126","descriptions":[{"lang":"en","value":"CAPEC-126 Path Traversal"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-28T13:21:51.596Z","orgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","shortName":"canonical"},"references":[{"tags":["vendor-advisory"],"url":"https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p"}],"solutions":[{"lang":"en","value":"Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later."}],"source":{"discovery":"EXTERNAL"},"title":"Path traversal in LXD btrfs storage driver allows arbitrary file deletion and write on host as root"}},"cveMetadata":{"assignerOrgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","assignerShortName":"canonical","cveId":"CVE-2026-85185","datePublished":"2026-09-28T13:21:51.596Z","dateReserved":"2026-09-03T11:46:34.569Z","dateUpdated":"2026-09-28T16:32:28.529Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-28 14:17:20","lastModifiedDate":"2026-09-28 17:17:51","problem_types":["CWE-22","CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"],"metrics":{"cvssMetricV31":[{"source":"security@ubuntu.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","baseScore":9.6,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.1,"impactScore":5.8}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-28T13:55:28.506443Z","id":"CVE-2026-85185","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"85185","Ordinal":"1","Title":"Path traversal in LXD btrfs storage driver allows arbitrary file","CVE":"CVE-2026-85185","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"85185","Ordinal":"1","NoteData":"Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.","Type":"Description","Title":"Path traversal in LXD btrfs storage driver allows arbitrary file"}]}}}