EUVD-2026-16466
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Description
Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.
Analysis
Incus system container and virtual machine manager versions prior to 6.23.0 allow authenticated users with instance access to read and write arbitrary files as root on the host system through exploitation of pongo2 template processing. The vulnerability (scored CVSS 10.0 critical) stems from a bypassed chroot isolation mechanism that was intended to confine template operations to instance filesystems but instead permits unrestricted host filesystem access. …
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Remediation
Within 24 hours: Identify all systems running Incus versions prior to 6.23.0 and document their criticality and network exposure. Within 7 days: Evaluate upgrade feasibility to Incus 6.23.0 or later; prioritize systems hosting sensitive workloads or those with untrusted user access. …
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External POC / Exploit Code
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