Improper Certificate Validation Affecting incus package, versions <6.0.4-2+deb13u7


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (7th percentile)

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  • Snyk IDSNYK-ECHOLATEST-INCUS-18496052
  • published1 Aug 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-40243  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Echo:latest incus to version 6.0.4-2+deb13u7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream incus package and not the incus package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1