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A path traversal vulnerability exists in the Btrfs storage driver (unpackVolume) of Canonical LXD on Linux. This flaw allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root by crafting a malicious subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.

CVE-2026-85526 is a path traversal vulnerability in the Btrfs storage driver (unpackVolume) component of Canonical LXD on Linux. An authenticated user who has privileges to create instances can exploit this vulnerability by providing a specially crafted subvolumes[].path entry in the backup/optimized_header.yaml file during the import of a btrfs optimized backup. This allows the attacker to delete or replace arbitrary files and directories on the host filesystem with root privileges, leading to full system compromise. The vulnerability affects multiple specific versions of LXD as listed, and has a CVSS v3.1 base score of 9.9, indicating critical severity.

A path traversal vulnerability exists in the Btrfs storage driver (unpackVolume) of Canonical LXD on Linux. This flaw allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root by crafting a malicious subvolumes[

Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges… (CVE-2026-85526)

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