CVE-2026-85526 Canonical LXD - Path Traversal

Canonical LXD on Linux contains a path traversal caused by crafted subvolumes[].path entry in backup/optimized_header.yaml during btrfs optimized backup import, letting authenticated users with instance creation privileges delete or replace arbitrary files as root.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.52% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-22

Vendor fix

Update to the latest version with the fix for this vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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