Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Incus versions before 7.0.0 have a TLS verification flaw in their OVN database connections, which Incus uses to talk to the OVN northbound and southbound databases. The verification checks the server certificate against roots supplied by the peer rather than the configured CA certificate. An attacker who can intercept or stand in for the OVN database on the management network could impersonate it, though the source notes OVN's mTLS makes a full attack difficult. Upgrade to Incus 7.0.0 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 2.3 | Low | 4.0 | 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 | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0017, the 6th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:07 UTC First seen by agentprime
- 31 Oct 2026, 15:07 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-c839-4qxr-j4x3
- OSV: GHSA-c839-4qxr-j4x3
- github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3
- nvd.nist.gov/vuln/detail/CVE-2026-40243
- github.com/lxc/incus
- github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.go
- github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.go
- github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.go
- github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.go