CVE-2026-33897
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | forky | fixed | 6.0.6-2 |
| debian | sid | fixed | 6.0.6-2 |
| debian | trixie | fixed | 6.0.4-2+deb13u5 |
| sles | affected | | |
| debian | bookworm | fixed | 5.0.2-5+deb12u4 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/lxc/incus/v6 | <6.23.0 | 6.23.0 |
| Go | github.com/lxc/incus | <=0.7.0 | |
| Go | github.com/lxc/incus | | |
References
- https://github.com/lxc/incus/security/advisories/GHSA-83xr-5xxr-mh92
- https://nvd.nist.gov/vuln/detail/CVE-2026-33897
- https://github.com/lxc/incus/commit/487edf5984fad89b0f762c03a7e211fdd38396fb
- https://github.com/lxc/incus
- https://security-tracker.debian.org/tracker/CVE-2026-33897
- https://www.suse.com/security/cve/CVE-2026-33897.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.