CVE-2026-66785
Malicious cluster can reroute peer-cluster traffic by advertising arbitrary subnets.
Is CVE-2026-66785 being exploited?
Not confirmed. CVE-2026-66785 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 0.10% probability of exploitation in the next 30 days.
How severe is CVE-2026-66785?
CVE-2026-66785 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-2026-66785?
Yes. A fix has been recorded for CVE-2026-66785. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66785 affect?
CVE-2026-66785 affects Submariner (Kubernetes multi-cluster networking), Connected Kubernetes clusters (spoke/peer clusters). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66785?
Isolate untrusted spokes, validate/block subnet advertisements, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious spoke can declare arbitrary subnets and force peer-cluster traffic through the attacker's tunnel, enabling interception and network disruption.
Immediate action required