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.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-094b7621cf advisory.

    Remove incus dependency from incus-agent.

    ----

    Update to [6.23](https://github.com/lxc/incus/releases/tag/v6.23.0)




Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4481307278 advisory.

    Remove incus dependency from incus-agent.

    ----

    Update to [6.23](https://github.com/lxc/incus/releases/tag/v6.23.0)



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6188 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6188-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 31, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : lxd     CVE ID         : CVE-2026-28384 CVE-2026-33542 CVE-2026-33897

    Multiple security issues were discovered in LXD, a system container     and virtual machine manager, which could result in privilege escalation     or the execution of arbitrary commands.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 5.0.2-5+deb12u4.

    For the stable distribution (trixie), these problems have been fixed in     version 5.0.2+git20231211.1364ae4-9+deb13u4.

    We recommend that you upgrade your lxd packages.

    For the detailed security status of lxd please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/lxd

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-33897)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-33897)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
307511	Fedora 43 : incus (2026-094b7621cf)	Nessus	Fedora Local Security Checks	high
307510	Fedora 42 : incus (2026-4481307278)	Nessus	Fedora Local Security Checks	high
304555	Debian dsa-6188 : golang-github-canonical-lxd-dev - security update	Nessus	Debian Local Security Checks	critical
439362	SCA: security update for github.com/lxc/incus/v6 (GHSA-83xr-5xxr-mh92)	Tenable Cloud Security	SCA Checks	critical
439362	SCA: security update for github.com/lxc/incus/v6 (GHSA-83xr-5xxr-mh92)	Tenable Self-Hosted Container Security	SCA Checks	critical
303970	Linux Distros Unpatched Vulnerability : CVE-2026-33897	Nessus	Misc.	critical

Detections

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CVE-2026-33897

critical

Tenable Plugins

high

high

critical

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critical

critical