CVE-2026-66780
Excessive broker Role in submariner-operator enables MITM of inter-cluster tunnel traffic.
Is CVE-2026-66780 being exploited?
Not confirmed. CVE-2026-66780 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 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-66780?
CVE-2026-66780 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-2026-66780?
Yes. A fix has been recorded for CVE-2026-66780. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66780 affect?
CVE-2026-66780 affects submariner-operator, submariner-k8s-broker-cluster Role, Submariner multi-cluster mesh, Kubernetes clusters with Submariner broker. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66780?
Restrict broker Role permissions, isolate/untrust joined clusters, segment mesh traffic, and apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A compromised joined cluster can overwrite other clusters' endpoints to redirect/inspect/modify inter-cluster tunnel traffic, enabling MITM and disruption across the mesh.
Immediate action required