Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller

{
  "id": "1319721d96f9b6196f5f86159a15fa56a201566368314bfcdafedf9660e56997",
  "url": "https://osv.dev/vulnerability/CVE-2026-15738",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller",
    "summary": "Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource. To mitigate this issue, users should upgrade to version 3.4.2.",
    "evidence": "osv:CVE-2026-15738",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-15738",
      "aliases": [
        "CVE-2026-15738"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kubernetes-sigs/aws-load-balancer-controller",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "22f6cd7fbfc3f3bdf14bfc41ef780510730b0cfe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.4.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "22f6cd7fbfc3f3bdf14bfc41ef780510730b0cfe"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.4.2"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.4.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.4.0",
            "v3.2.2",
            "v3.3.0",
            "v3.1.0",
            "v3.0.0",
            "v3.4.1",
            "v2.14.1",
            "v2.13.4",
            "znixon/v2.12",
            "v2.12.0",
            "v2.11.0",
            "v2.16.0",
            "v2.15.0",
            "v3.2.1",
            "v3.2.0",
            "v2.17.0",
            "v2.14.0",
            "v2.13.3",
            "v2.13.2",
            "zac-v2.13.1",
            "v2.13.1",
            "zac-tag-2",
            "zac-tag",
            "v2.13.0",
            "v2.10.0",
            "v2.9.0",
            "v2.7.0",
            "v2.6.0",
            "v2.5.4",
            "v2.5.3",
            "v2.5.2",
            "v2.5.1",
            "v2.5.0",
            "v2.4.6",
            "v2.4.5",
            "v2.4.4",
            "v2.4.3",
            "v2.4.1",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.1",
            "v2.2.0",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "v2.0.0-rc5",
            "v2.0.0-rc4",
            "v2.0.0-rc3",
            "v2.0.0-rc2",
            "v2.0.0-rc1",
            "v2.0.0-rc0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15738.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.773834789Z",
      "provider": "osv",
      "references": [
        "https://aws.amazon.com/security/security-bulletins/2026-055-aws/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15738.json",
        "https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v3.4.2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-15738"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-653"
        ],
        "cna_assigner": "AMZN",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15738.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-15738",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 502112,
  "published_at": "2026-07-14T20:19:23.721+00:00"
}