Incus is a system container and virtual machine manager. Prior to version 7.3.0, an unprivileged, project-confined Incus user (a non-admin TLS/RBAC identity with `can_create_images` and `can_create_instances`) can execute arbitrary code as root on the host. A crafted image ships `backup.yaml` as a symlink to a host file. When the root daemon writes the instance's backup file, it follows the symlink. Version 7.3.0 patches the issue.

CVE-2026-63125 affects Incus, a system container and virtual machine manager, in versions prior to 7.3.0. An unprivileged, project-confined user with can_create_images and can_create_instances permissions can escalate privileges to execute arbitrary code as root on the host. The attack vector involves crafting a malicious image that ships backup.yaml as a symlink pointing to a host file. When the root daemon writes the instance's backup file, it follows the symlink, enabling file write as root and leading to code execution. The vulnerability affects non-admin TLS/RBAC identities, making it accessible to low-privileged users. Version 7.3.0 of Incus patches this issue. Organizations using Incus for container or VM management should upgrade immediately.