{"id":"CVE-2026-66787","revision":"d5cb5fd05297499a835c4728f61aea3a","records":[{"revision":"d5cb5fd05297499a835c4728f61aea3a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-66787","aliases":[],"title":"Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses","description":"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.","state":0,"publishedAt":"2026-08-20T18:15:23.339+00:00","modifiedAt":"2026-10-19T17:02:22.592+00:00","affected":[{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/lighthouse-agent-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.16\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/lighthouse-agent-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1790670439\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.16::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/lighthouse-coredns-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.16\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/lighthouse-coredns-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1790670231\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.16::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/subctl-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.16\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/subctl-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1790670243\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.16::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/submariner-rhel9-operator","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.16\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/submariner-rhel9-operator\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1790670912\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.16::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/lighthouse-agent-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.17\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/lighthouse-agent-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1788023916\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.17::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/lighthouse-coredns-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.17\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/lighthouse-coredns-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1788023940\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.17::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/subctl-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.17\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/subctl-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1788105072\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.17::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"rhacm2/submariner-rhel9-operator","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.17\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"rhacm2/submariner-rhel9-operator\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1788073481\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:acm:2.17::el9\"\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N","score":8.7,"severity":"HIGH"}],"references":["https://access.redhat.com/errata/RHSA-2026:63016","https://access.redhat.com/errata/RHSA-2026:85227","https://access.redhat.com/security/cve/CVE-2026-66787","https://bugzilla.redhat.com/show_bug.cgi?id=2507532"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-66787","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-66787","identifiers":["CVE-2026-66787"]},"retained":false,"historicalAffected":[]}],"coverage":[]}