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Medium

CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation

Type: advisorySources: OSV

Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-53935
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 06:06 UTC · Revision 1

Source evidence

CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation

core-osv · Original source

Published 7 Jul 2026, 20:44 UTC

Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.

osv:CVE-2026-53935
Complete source record
{
  "id": "109345cdcd1ccd344b51ef221b7b7d0d27eb3fc02335edfe286cc7ab574a7b3a",
  "url": "https://osv.dev/vulnerability/CVE-2026-53935",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation",
    "summary": "Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.",
    "evidence": "osv:CVE-2026-53935",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-53935",
      "aliases": [
        "BIT-cilium-2026-53935",
        "BIT-cilium-operator-2026-53935",
        "BIT-hubble-relay-2026-53935",
        "CVE-2026-53935",
        "GHSA-q6h5-q3q6-f87x",
        "GO-2026-5914"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cilium/cilium",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "383d39c83a022b95ccc1b4738c9e33e63534af34"
                },
                {
                  "introduced": "5bd307a8f6fbf3489005944ded2ed085fc642cc2"
                },
                {
                  "fixed": "6bf2fe83d2fce50283b702d96c6190f7693dc224"
                },
                {
                  "introduced": "7c6667e1e707d7f39a4af3409c2a9ebea2917d32"
                },
                {
                  "fixed": "95e477fdcfd35d438b135f4d981ee20ce3016ac3"
                },
                {
                  "fixed": "81d446395673dc2c684c047c12715caffac1a351"
                },
                {
                  "fixed": "92ca32eda85aa0c7611c28221cc26fa08be17ebc"
                },
                {
                  "fixed": "fe7eb53c7aac9fa7ec610b1975d73fbbb198c66d"
                }
              ],
              "database_specific": {
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                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.17.16"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.18.2"
                      },
                      {
                        "fixed": "1.18.10"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.19.0"
                      },
                      {
                        "fixed": "1.19.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "81d446395673dc2c684c047c12715caffac1a351"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "92ca32eda85aa0c7611c28221cc26fa08be17ebc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "fe7eb53c7aac9fa7ec610b1975d73fbbb198c66d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.19.3",
            "1.19.3",
            "v1.17.15",
            "1.17.15",
            "v1.18.9",
            "1.18.9",
            "v1.17.14",
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            "v1.19.2",
            "1.19.2",
            "v1.18.8",
            "1.18.8",
            "v1.19.1",
            "1.19.1",
            "v1.17.13",
            "1.17.13",
            "v1.18.7",
            "1.18.7",
            "v1.19.0",
            "1.19.0",
            "v1.18.6",
            "1.18.6",
            "v1.17.12",
            "1.17.12",
            "v1.18.5",
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            "v1.17.11",
            "1.17.11",
            "v1.18.4",
            "1.18.4",
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            "v1.18.3",
            "1.18.3",
            "v1.17.9",
            "1.17.9",
            "v1.17.8",
            "1.17.8",
            "v1.18.2",
            "1.18.2",
            "v1.17.7",
            "1.17.7",
            "v1.17.6",
            "1.17.6",
            "v1.17.5",
            "1.17.5",
            "v1.17.4",
            "1.17.4",
            "v1.17.3",
            "1.17.3",
            "v1.17.2",
            "1.17.2",
            "v1.17.1",
            "1.17.1",
            "v1.17.0",
            "1.17.0",
            "v1.17.0-rc.2",
            "1.17.0-rc.2",
            "v1.17.0-rc.1",
            "1.17.0-rc.1",
            "v1.17.0-rc.0",
            "1.17.0-rc.0",
            "v1.17.0-pre.3",
            "1.17.0-pre.3",
            "v1.17.0-pre.2",
            "1.17.0-pre.2",
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            "v1.17.0-pre.0",
            "1.17.0-pre.0",
            "v1.16.0-rc.0",
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            "v1.16.0-pre.3",
            "1.16.0-pre.3",
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            "1.16.0-pre.2",
            "v1.16.0-pre.1",
            "1.16.0-pre.1",
            "v1.16.0-pre.0",
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            "1.14.0-snapshot.1",
            "v1.14.0-snapshot.0",
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            "v1.5.0-rc1",
            "v1.3.0-rc1",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53935.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.092295973Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53935.json",
        "https://github.com/cilium/cilium/security/advisories/GHSA-q6h5-q3q6-f87x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53935",
        "https://github.com/cilium/cilium/commit/81d446395673dc2c684c047c12715caffac1a351",
        "https://github.com/cilium/cilium/commit/92ca32eda85aa0c7611c28221cc26fa08be17ebc",
        "https://github.com/cilium/cilium/commit/fe7eb53c7aac9fa7ec610b1975d73fbbb198c66d",
        "https://github.com/cilium/cilium/pull/45412",
        "https://github.com/cilium/cilium/pull/45584",
        "https://github.com/cilium/cilium/pull/45585"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53935.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53935",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518433,
  "published_at": "2026-07-07T20:44:54.972+00:00"
}