# CVE-2026-85526: incus: Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with...

CVE-2026-85526 is fixed in incus on 1 platform, first by DEBIAN-CVE-2026-85526, released September 29, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-85526
- Priority: Urgent
- CVSS: 9.9 (critical)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | incus Debian 13.5 (trixie) | 6.0.4-2+deb13u1 | [DEBIAN-CVE-2026-85526](https://patchblox.com/security/data/fix/linux/debian-cve-2026-85526.md) | Sep 29, 2026 |
| Linux | incus Debian 14 | 7.0.1-5 | [DEBIAN-CVE-2026-85526](https://patchblox.com/security/data/fix/linux/debian-cve-2026-85526.md) | Sep 29, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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