Vulnerability in Linuxcontainers Incus
CVE-2026-40243
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…
Vulnerability class: Improper Certificate Validation
EPSS: 0.000 (1.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Linuxcontainers Incus
- Lxc Incus — versions < 7.0.0
Weakness classification (CWE)
References
- https://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3 (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.go (Product, x_refsource_MISC)
- https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.go (Product, x_refsource_MISC)
- https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.go (Product, x_refsource_MISC)
- https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.go (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40243?
- CVE-2026-40243 is a medium-severity vulnerability in Linuxcontainers Incus, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2026-05-06.
- How severe is CVE-2026-40243?
- Medium severity. CVSS v3 base score is 4.8 out of 10.