CVE-2026-85526

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 Sep 28, 2026
  • CVSS 9.9 critical
  • 0.5% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-85526 at the National Vulnerability Database