# CVE-2026-63343

## Summary

- **CVE ID:** CVE-2026-63343
- **Severity:** CRITICAL
- **CVSS Score:** 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-73
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 21, 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.

## Affected Products

- lxc — incus (< 7.3.0)

## References

- [CNA](https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._