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9.9
CVE-2026-63343: Security update for incus
CVE-2026-63343 · published 13 days ago
Summary
A security issue affects incus (Debian). The advisory does not describe the issue in detail. Check the linked advisory for the fixed version and details.
What to do
- Update debian incus to version 6.0.4-2+deb13u9.
- Update debian incus to version 7.0.1-2.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:24.04:LTS | canonical | incus | All versions |
| Ubuntu:Pro:26.04:LTS | canonical | incus | All versions |
| Debian:13 | debian | incus |
< 6.0.4-2+deb13u9 Fix: upgrade to 6.0.4-2+deb13u9
|
| Debian:14 | debian | incus |
< 7.0.1-2 Fix: upgrade to 7.0.1-2
|
| – | lxc | incus | < 7.3.0 |
Original advisory text
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 In...
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-63343 Vendor Advisory
- https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p Third Party Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63343... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-63343 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-63343 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-63343 Third Party Advisory
- https://github.com/lxc/incus/pull/3750 Third Party Advisory
Severity
9.9
Critical
CVSS 3.1: 9.9 (MITRE)
CVSS 3.1: 9.9 (OSV)
Exploitation
EPSS <1%
Type
CWE-73External Control of File Name or Path
Timeline
Published21 Aug 2026
Updated2 Sep 2026
First seen31 Jul 2026
Sources
CVE-2026-63343 · MITRE
CVE-2026-63343 · NVD
GHSA-fmjx-5j3g-997p · GHSA
CVE-2026-63343 · OSV
DEBIAN-CVE-2026-63343 · OSV
UBUNTU-CVE-2026-63343 · OSV
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