High

Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijack

Type: advisorySource: Official CVE List1 source record

A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.

Announced 20 Aug 2026Group revision 1

Original source ↗

CVE-2026-66785

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-2026-66785

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 2.16

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 2.16

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 2.16

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

Red Hat Advanced Cluster Management for Kubernetes 2.17

Source reference: /containers/cna/affected/8/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/9/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/10/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/11/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/12/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/13/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

Source reference: /containers/cna/affected/14/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

Source reference: /containers/cna/affected/15/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"
  },
  {
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    ],
    "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": "1790670508",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-gateway-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": "1790670233",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-globalnet-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:2.16::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2.16",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790670254",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-route-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": "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": "1788043964",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-gateway-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": "1788043961",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-globalnet-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"
  },
  {
    "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": "1788043970",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "rhacm2/submariner-route-agent-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2",
    "packageName": "rhacm2/submariner-addon-rhel9",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:acm:2"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Advanced Cluster Management for Kubernetes 2",
    "packageName": "rhacm2/submariner-operator-bundle",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-66785
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #39076 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 10:40:25 GMT
Publisher date: Thu, 20 Aug 2026 18:15:06 GMT

Read the original announcement

Revision history

25 Oct 2026CVE-2026-66785 · Revision 1Source updated