CVE-2026-23953
lxd - security update
Description
Incus is a system container and virtual machine manager. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the ‘incus’ group) can create an environment variable containing newlines, which can be used to add additional configuration items in the container’s lxc.conf due to newline injection. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. Exploiting this issue on IncusOS requires a slight modification of the payload to change to a different writable directory for the validation step (e.g /tmp). This can be confirmed with a second container with /tmp mounted from the host (A privileged action for validation only). 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-2026-23953
To remediate CVE-2026-23953, upgrade the affected package to a fixed version below.
- —upgrade to 6.0.4-2+deb13u4 or later
- —upgrade to 6.0.4-2+deb13u4 or later
- —upgrade to 5.0.2-5+deb12u3 or later
- —upgrade to 5.0.2-5+deb12u3 or later
- —no fix listed
- —upgrade to 6.21.0 or later
- —no fix listed
Is CVE-2026-23953 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- from 0, < 6.0.4-2+deb13u4
- from 0, < 6.0.4-2+deb13u4
- from 0, < 5.0.2-5+deb12u3
- from 0, < 5.0.2-5+deb12u3
- from 0
- from 0, < 6.21.0
- >= 6.1.0
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 |