CVE-2026-33897

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
incus (PTS)	trixie (security), trixie	6.0.4-2+deb13u4	fixed
	forky	6.0.6-1	vulnerable
	sid	6.0.6-2	fixed
lxd (PTS)	bookworm	5.0.2-5+deb12u2	fixed
	bookworm (security)	5.0.2-5+deb12u3	fixed
	trixie (security), trixie	5.0.2+git20231211.1364ae4-9+deb13u3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
incus	source	trixie	(not affected)
incus	source	(unstable)	6.0.6-2
lxd	source	(unstable)	(not affected)

Notes

[trixie] - incus <not-affected> (Vulnerable code not present)
- lxd <not-affected> (Vulnerable code not present)
https://github.com/lxc/incus/pull/3092
https://github.com/lxc/incus/security/advisories/GHSA-83xr-5xxr-mh92