CVE-2026-66787Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses
Updated under an hour ago ()
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It affects Red Hat Advanced Cluster Management for Kubernetes 2.17. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluster can exploit this by creating EndpointSlices with attacker-controlled IP addresses, causing other clusters' lighthouse DNS to redirect legitimate service traffic to malicious endpoints. This enables a remote attacker to conduct transparent Man-in-the-Middle (MITM) attacks on cross-cluster service communications, potentially leading to unauthorized information disclosure and data manipulation.
- CVSS
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
from 1788023916 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:63016vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-66787vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2507532issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.