GHSA-7FH9-J94V-W42J
Vulnerability from github – Published: 2026-08-20 21:31 – Updated: 2026-09-03 15:32A 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.
{
"affected": [],
"aliases": [
"CVE-2026-66787"
],
"database_specific": {
"cwe_ids": [
"CWE-345",
"CWE-489"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-20T19:16:58Z",
"severity": "HIGH"
},
"details": "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\u0027 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.",
"id": "GHSA-7fh9-j94v-w42j",
"modified": "2026-09-03T15:32:02Z",
"published": "2026-08-20T21:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66787"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:63016"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-66787"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507532"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
}
]
}
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