CVE-2026-85526
Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-22 |
| Vendor | canonical |
| Product | lxd |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 28, 2026 |
| Last Updated | Sep 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Canonical / LXD
4.0.0 < 4.0.14 5.0.0 < 5.0.10 5.21.0 < 5.21.8 6.0 < 6.10
References
github.com: https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv github.com: https://github.com/canonical/lxd-private/pull/87 github.com: https://github.com/canonical/lxd-private/pull/105 github.com: https://github.com/canonical/lxd-private/pull/104 github.com: https://github.com/canonical/lxd-private/pull/103 github.com: https://github.com/canonical/lxd-private/pull/84