CVE-2026-40243

May 6, 2026, 9:22 p.m.

2.3
Low

Description

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.

Product(s) Impacted

Vendor Product Versions
Incus
  • Incus
  • <7.0.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-295
Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a incus incus <7.0.0 / / / / / / /

References

https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.go
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.go
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.go
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.go
https://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3

Tags

[email protected]
CWE-295
2026-05-06
CVE-2026-40243

CVSS Score

2.3 / 10

CVSS Data - 4.0

  • Attack Vector: ADJACENT
  • Attack Complexity: HIGH
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: LOW
  • Integrity Impact: LOW
  • Availability Impact: NONE
  • Exploit Maturity: NOT_DEFINED

    • CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: May 6, 2026, 9:16 p.m.
Last Modified: May 6, 2026, 9:22 p.m.

Status : Awaiting Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.