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.

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-6153 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6153-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 01, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : lxd     CVE ID         : CVE-2026-23953 CVE-2026-23954

    Two security issues were discovered in LXD, a system container and     virtual machine manager, which could result the in execution of arbitrary     commands via malformed images.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 5.0.2-5+deb12u3.

    For the stable distribution (trixie), these problems have been fixed in     version 5.0.2+git20231211.1364ae4-9+deb13u3.

    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 multiple vulnerabilities referenced in the following CVEs:

  - 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. (CVE-2026-23953)

  - Incus is a system container and virtual machine manager. Versions 6.21.0 and below allow a user with the
    ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory
    traversal or symbolic links in the templating functionality to achieve host arbitrary file read, and host
    arbitrary file write. This ultimately results in arbitrary command execution on the host. When using an
    image with a metadata.yaml containing templates, both the source and target paths are not checked for
    symbolic links or directory traversal. This can also be exploited in IncusOS. A fix is planned for
    versions 6.0.6 and 6.21.0, but they have not been released at the time of publication. (CVE-2026-23954)

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6109 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6109-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     January 23, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : incus     CVE ID         : CVE-2026-23953 CVE-2026-23954

    Two security issues were discovered in Incus, a system container and     virtual machine manager, which could result the in execution of arbitrary     commands via malformed images.

    For the stable distribution (trixie), these problems have been fixed in     version 6.0.4-2+deb13u4.

    We recommend that you upgrade your incus packages.

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

    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.

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. 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. (CVE-2026-23953)

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
300202	Debian dsa-6153 : golang-github-canonical-lxd-dev - security update	Nessus	Debian Local Security Checks	high
436933	Alpine: multiple incus packages: security update to 6.0.5-r6	Tenable Cloud Security	Alpine Linux Local Security Checks	high
436933	Alpine: multiple incus packages: security update to 6.0.5-r6	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
436932	Alpine: multiple incus-feature packages: security update to 6.21.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
436932	Alpine: multiple incus-feature packages: security update to 6.21.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
296419	Debian dsa-6109 : golang-github-lxc-incus-dev - security update	Nessus	Debian Local Security Checks	high
296221	Linux Distros Unpatched Vulnerability : CVE-2026-23953	Nessus	Misc.	high

Detections

Analytics

CVE-2026-23953

high

Tenable Plugins

high

high

high

high

high

high

high

high

high