Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-63125Incus vulnerable to root RCE via image backup.yaml symlink
Critical 9.9
In plain English
A critical-severity security flaw in incus from lxc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | incus | 6.0.4-2+deb13u9 | DEBIAN-CVE-2026-63125 |
| Debian:14 | incus | 7.0.1-2 | DEBIAN-CVE-2026-63125 |
| Ubuntu:26.10 | incus | no fix listed | UBUNTU-CVE-2026-63125 |
Affected products (as reported)
Weakness: CWE-59, CWE-61 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/lxc/incus/security/advisories/GHSA-6rqx-22hc-qm36 x_refsource_CONFIRM