Kube-router Proxy Module Blindly Trusts ExternalIPs/LoadBalancer IPs Enabling Cluster-Wide Traffic Hijacking and DNS DoS

{
  "id": "6ab5bb10ca319da54d9270c86bf34d5002ff7b19861104151d1b0eae0c4afe9c",
  "url": "https://osv.dev/vulnerability/CVE-2026-32254",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Kube-router Proxy Module Blindly Trusts ExternalIPs/LoadBalancer IPs Enabling Cluster-Wide Traffic Hijacking and DNS DoS",
    "summary": "Kube-router is a turnkey solution for Kubernetes networking. Prior to version 2.8.0, Kube-router's proxy module does not validate externalIPs or loadBalancer IPs before programming them into the node's network configuration. Version 2.8.0 contains a patch for the issue. Available workarounds include enabling DenyServiceExternalIPs feature gate, deploying admission policy, restricting service creation RBAC, monitoring service changes, and applying BGP prefix filtering.",
    "evidence": "osv:CVE-2026-32254",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-32254",
      "aliases": [
        "CVE-2026-32254",
        "GHSA-phqm-jgc3-qf8g",
        "GO-2026-4724"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cloudnativelabs/kube-router",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0e94d43d4010c2d057c3e1f17c555600dde9fe7f"
                },
                {
                  "fixed": "a1f0b2eea3ee0f66b9a5b5c49dcb714619ccd456"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:kube-router:kube-router:*:*:*:*:*:kubernetes:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.8.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a1f0b2eea3ee0f66b9a5b5c49dcb714619ccd456"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0e94d43d4010c2d057c3e1f17c555600dde9fe7f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.8.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.7.0",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.0",
            "v2.2.0",
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            "v2.1.0",
            "v1.6.0",
            "v2.0.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0-rc6",
            "v1.3.0-rc2",
            "v1.3.0-rc1",
            "v1.2.1",
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            "v0.4.0-rc1",
            "v0.3.2",
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            "v0.2.5",
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            "v0.2.0",
            "v0.2.0-beta.10",
            "v0.2.0-beta.9",
            "v0.2.0-beta.8",
            "v0.2.0-beta.7",
            "v0.2.0-beta.6",
            "v0.1.0",
            "v0.2.0-beta.5",
            "v0.2.0-beta.4",
            "v0.2.0-beta.3",
            "v0.2.0-beta.2",
            "v0.2.0-beta.1",
            "v0.1.0-rc2",
            "v0.1.0-rc1",
            "v0.0.20",
            "v0.0.19",
            "v0.0.18",
            "v0.0.17",
            "v0.0.16",
            "v0.0.15",
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            "v0.0.13",
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            "v0.0.6",
            "v0.0.5",
            "0.0.4",
            "0.0.3",
            "0.0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32254.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.179251544Z",
      "provider": "osv",
      "references": [
        "https://github.com/cloudnativelabs/kube-router/releases/tag/v2.8.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32254.json",
        "https://github.com/cloudnativelabs/kube-router/security/advisories/GHSA-phqm-jgc3-qf8g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-32254",
        "https://github.com/cloudnativelabs/kube-router/commit/a1f0b2eea3ee0f66b9a5b5c49dcb714619ccd456"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32254.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-32254",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491834,
  "published_at": "2026-03-18T03:14:39.392+00:00"
}