CVE-2026-23953
HIGH
GHSA-x6jc-phwx-hp32
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
4Tags
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.
Analysis
Incus contains a vulnerability that allows attackers to adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command exec (CVSS 8.7).
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Remediation
Within 24 hours: Identify all systems running Incus and assess which are internet-facing or accessible to untrusted networks. Within 7 days: Apply the available vendor patch to all affected Incus instances, prioritizing production and customer-facing environments. …
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External POC / Exploit Code
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