CVE-2026-23954
Incus container image templating arbitrary host file read and write in github.com/lxc/incus
Description
Incus is a system container and virtual machine manager. Versions 6.21.0 and below allow a user with the ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory traversal or symbolic links in the templating functionality to achieve host arbitrary file read, and host arbitrary file write. This ultimately results in arbitrary command execution on the host. When using an image with a metadata.yaml containing templates, both the source and target paths are not checked for symbolic links or directory traversal. This can also be exploited in IncusOS. A fix is planned for versions 6.0.6 and 6.21.0, but they have not been released at the time of publication.
How to fix CVE-2026-23954
To remediate CVE-2026-23954, upgrade the affected package to a fixed version below.
- —upgrade to 6.0.4-2+deb13u4 or later
- —upgrade to 5.0.2-5+deb12u3 or later
- —no fix listed
- —no fix listed
- —no fix listed
Is CVE-2026-23954 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 6.0.4-2+deb13u4
- from 0, < 5.0.2-5+deb12u3
- from 0
- >= 6.1.0
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.7 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |