Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN client implementations disable Go standard TLS server verification and replace it with custom peer-certificate verification logic. That replacement verifier does not anchor trust in the configured CA certificate. Instead, it constructs the verification root set from certificates supplied by the peer during the handshake, so the configured CA is parsed but not used as the trust anchor for the final verification decision. In OVN-enabled deployments that use these SSL database connection paths, an attacker able to impersonate or intercept the OVN endpoint on the management network can present a rogue self-signed certificate chain, and Incus will accept this certificate as valid. This issue defeats the intended CA-based trust model for OVN database connections and permits endpoint impersonation by an active attacker in a suitable network position. This issue is fixed in version 7.0.0.

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

  - Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation
    logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN
    client implementations disable Go standard TLS server verification and replace it with custom peer-
    certificate verification logic. That replacement verifier does not anchor trust in the configured CA
    certificate. Instead, it constructs the verification root set from certificates supplied by the peer
    during the handshake, so the configured CA is parsed but not used as the trust anchor for the final
    verification decision. In OVN-enabled deployments that use these SSL database connection paths, an
    attacker able to impersonate or intercept the OVN endpoint on the management network can present a rogue
    self-signed certificate chain, and Incus will accept this certificate as valid. This issue defeats the
    intended CA-based trust model for OVN database connections and permits endpoint impersonation by an active
    attacker in a suitable network position. This issue is fixed in version 7.0.0. (CVE-2026-40243)

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6244 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6244-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 02, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : incus     CVE ID         : CVE-2026-40195 CVE-2026-40197 CVE-2026-40243 CVE-2026-40251                      CVE-2026-41647 CVE-2026-41648 CVE-2026-41684 CVE-2026-41685

    Multiple security issues were discovered in Incus, a system container     and virtual machine manager, which could result in denial of service,

    For the stable distribution (trixie), these problems have been fixed in     version 6.0.4-2+deb13u7.

    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 before 7.0.0, broken TLS validation     logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN     client implementations disable Go standard TLS server verification and replace it with custom peer-     certificate verification logic. That replacement verifier does not anchor trust in the configured CA     certificate. Instead, it constructs the verification root set from certificates supplied by the peer     during the handshake, so the configured CA is parsed but not used as the trust anchor for the final     verification decision. In OVN-enabled deployments that use these SSL database connection paths, an     attacker able to impersonate or intercept the OVN endpoint on the management network can present a rogue     self-signed certificate chain, and Incus will accept this certificate as valid. This issue defeats the     intended CA-based trust model for OVN database connections and permits endpoint impersonation by an active     attacker in a suitable network position. This issue is fixed in version 7.0.0. (CVE-2026-40243)

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

ID	Name	Product	Family	Severity
441057	SCA: security update for github.com/lxc/incus/v6/cmd/incusd (GHSA-c839-4qxr-j4x3)	Tenable Cloud Security	SCA Checks	low
441057	SCA: security update for github.com/lxc/incus/v6/cmd/incusd (GHSA-c839-4qxr-j4x3)	Tenable Self-Hosted Container Security	SCA Checks	low
311800	Debian dsa-6244 : golang-github-lxc-incus-dev - security update	Nessus	Debian Local Security Checks	high
311660	Linux Distros Unpatched Vulnerability : CVE-2026-40243	Nessus	Misc.	low

Detections

Analytics

CVE-2026-40243

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Tenable Plugins

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high

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