High

Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses

Type: advisorySource: Official CVE List1 source record

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.

Announced 20 Aug 2026Source revision 1

Original source ↗

CVE-2026-66787

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-66787

Red Hat Advanced Cluster Management for Kubernetes 2.16

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.16

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.16

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.16

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.17

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.17

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.17

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Advanced Cluster Management for Kubernetes 2.17

Source reference: /containers/cna/affected/7/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.16::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790670439",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/lighthouse-agent-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.16::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790670231",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/lighthouse-coredns-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.16::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790670243",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/subctl-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.16::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790670912",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-rhel9-operator",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.17::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
    "versions": [
      {
        "status": "unaffected",
        "version": "1788023916",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/lighthouse-agent-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.17::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
    "versions": [
      {
        "status": "unaffected",
        "version": "1788023940",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/lighthouse-coredns-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.17::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
    "versions": [
      {
        "status": "unaffected",
        "version": "1788105072",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/subctl-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2.17::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.17",
    "versions": [
      {
        "status": "unaffected",
        "version": "1788073481",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-rhel9-operator",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-66787
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #39058 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 10:40:11 GMT
Publisher date: Thu, 20 Aug 2026 18:15:23 GMT

Read the original announcement