CVE-2026-63343
Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
- State
- Published
- Severity
- 9.9 Critical
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Reserved
- Jul 16, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
Weaknesses
- CWE-73 External Control of File Name or Path
Affected Products
| Product | Versions |
|---|---|
incuslxc |
|
References
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