CVE-2026-66788
Remote resource-injection via broker labels in Lighthouse allows cross-cluster service/resource tampering.
Is CVE-2026-66788 being exploited?
Not confirmed. CVE-2026-66788 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-66788?
CVE-2026-66788 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-66788?
Yes. A fix has been recorded for CVE-2026-66788. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66788 affect?
CVE-2026-66788 affects Lighthouse (Submariner Lighthouse), Kubernetes peer clusters, OpenShift clusters, Broker objects/control plane. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66788?
Apply vendor patch when available; restrict broker label/annotation rights and isolate/trust spokes.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Compromised spoke can inject EndpointSlices/ServiceImports into any peer namespace, enabling privilege escalation, service hijack, and cluster compromise.
Immediate action required