CVE-2026-66787
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
8.7
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-08-20 19:16:58.637000
Last modified
2026-10-19 17:17:21.453000
View original CVE JSON
{
"id": "CVE-2026-66787",
"sourceIdentifier": "[email protected]",
"published": "2026-08-20T19:16:58.637",
"lastModified": "2026-10-19T17:17:21.453",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Se encontró una falla en el componente lighthouse de Red Hat Advanced Cluster Management para Kubernetes. Esta vulnerabilidad se origina en la validación insuficiente de las direcciones IP anunciadas dentro de los objetos EndpointSlice. Un clúster spoke comprometido puede explotar esto creando EndpointSlices con direcciones IP controladas por el atacante, haciendo que el DNS lighthouse de otros clústeres redirija el tráfico de servicio legítimo a puntos finales maliciosos. Esto permite a un atacante remoto realizar ataques transparentes de Man-in-the-Middle (MitM) en comunicaciones de servicio entre clústeres, lo que podría llevar a la revelación de información no autorizada y manipulación de datos."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/lighthouse-agent-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.16::el9"
],
"versions": [
{
"version": "1790670439",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/lighthouse-coredns-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.16::el9"
],
"versions": [
{
"version": "1790670231",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/subctl-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.16::el9"
],
"versions": [
{
"version": "1790670243",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/submariner-rhel9-operator",
"cpes": [
"cpe:/a:redhat:acm:2.16::el9"
],
"versions": [
{
"version": "1790670912",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/lighthouse-agent-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.17::el9"
],
"versions": [
{
"version": "1788023916",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/lighthouse-coredns-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.17::el9"
],
"versions": [
{
"version": "1788023940",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/subctl-rhel9",
"cpes": [
"cpe:/a:redhat:acm:2.17::el9"
],
"versions": [
{
"version": "1788105072",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhacm2/submariner-rhel9-operator",
"cpes": [
"cpe:/a:redhat:acm:2.17::el9"
],
"versions": [
{
"version": "1788073481",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "HIGH",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 2.3,
"impactScore": 5.8
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-20T18:51:33.566517Z",
"id": "CVE-2026-66787",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-345"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:63016",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:85227",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-66787",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507532",
"source": "[email protected]"
}
]
}