CVE-2026-63343: Lxc Incus

Critical severity, CVSS 9.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue.

Affected products

• Lxc Incus: before 7.3.0 (fixed in 7.3.0)

Published 2026-08-21. Last modified 2026-09-18.