Vulnerability in Lxc Incus
CVE-2026-63125
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.
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Lxc Incus — versions < 7.3.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-63125?
- CVE-2026-63125 is a critical-severity vulnerability in Lxc Incus, classified under Improper Link Resolution Before File Access. CVSS score: 9.9/10. Published 2026-08-21.
- How severe is CVE-2026-63125?
- Critical severity. CVSS v3 base score is 9.9 out of 10.