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Vulnerabilities

CVE-2026-40243 Detail

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.

Metrics

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CVSS 4.0 Severity and Vector Strings:

👁 NIST CVSS score

NIST: NVD

NVD assessment not yet provided.

👁 Nist CVSS score does not match with CNA score

CNA: GitHub, Inc.

CVSS-B 2.3 LOW

Vector: 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

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.go	GitHub, Inc.	Product
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.go	GitHub, Inc.	Product
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.go	GitHub, Inc.	Product
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.go	GitHub, Inc.	Product
https://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3	CISA-ADP, GitHub, Inc.	Exploit Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-295	Improper Certificate Validation	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

New CVE Received from GitHub, Inc. 5/06/2026 5:16:01 PM

Action	Type	Old Value
Added	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.
Added	CVSS V4.0	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
Added	CWE	CWE-295
Added	Reference	https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.go
Added	Reference	https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.go
Added	Reference	https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.go
Added	Reference	https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.go
Added	Reference	https://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3

Quick Info

CVE Dictionary Entry:
CVE-2026-40243
NVD Published Date:
05/06/2026
NVD Last Modified:
06/17/2026
Source:
GitHub, Inc.

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40243

⇱ NVD - CVE-2026-40243