{"id":"CVE-2026-85526","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-85526","generatedAt":"2026-10-28T01:46:51.177Z","title":"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…","description":"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.","published":"2026-09-28T14:17:20.000Z","lastModified":"2026-09-29T04:18:01.000Z","status":"Deferred","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"3.1","score":9.9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-22"],"affected":[],"epss":{"score":0.00528,"percentile":0.4441,"date":"2026-10-26","history":[{"date":"2026-09-29","score":0.00516,"percentile":0.41635}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-28T14:17:20.000Z","detail":{"score":"9.9","severity":"CRITICAL","publishedAt":"2026-09-28T14:17:20.423Z"},"summary":"New CVE, critical severity (CVSS 9.9)."}],"references":[{"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","source":"security@ubuntu.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-85526","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}