{"id":"GO-2026-6367","revision":null,"records":[{"revision":"842b9f3a9ba0403d9fbb3750b65b4db1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-56743","aliases":[],"title":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match","description":"Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.","state":0,"publishedAt":"2026-07-15T19:15:30.924+00:00","modifiedAt":"2026-07-16T13:03:36.08+00:00","affected":[{"ecosystem":"Vendor product","name":"cilium","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cilium\",\n                    \"product\": \"cilium\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.19.0, < 1.19.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r","https://github.com/cilium/cilium/pull/46305","https://github.com/cilium/cilium/pull/46456","https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8","https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171","https://github.com/cilium/cilium/releases/tag/v1.19.5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56743","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56743","identifiers":["CVE-2026-56743"]},"retained":false,"historicalAffected":[]},{"revision":"1b0522ffff4343bdb19b94efcfa05f2e","observedAt":"2026-11-13T15:06:24.584+00:00","statement":{"source":"euvd","id":"EUVD-2026-44774","aliases":["CVE-2026-56743","GHSA-fm8w-2m5w-9j7r"],"title":"Cilium is a networking, observability, and security solution. 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From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.","state":0,"publishedAt":"2026-07-15T20:17:51.987+00:00","modifiedAt":"2026-07-17T17:29:02.113+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8","https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171","https://github.com/cilium/cilium/pull/46305","https://github.com/cilium/cilium/pull/46456","https://github.com/cilium/cilium/releases/tag/v1.19.5","https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-56743","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-863"],"productCriteria":["cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-07-15T20:17:51.987","lastModified":"2026-07-17T17:29:02.113"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-56743","identifiers":["CVE-2026-56743"]},"retained":false,"historicalAffected":[]},{"revision":"40d7e06ca7c54dc5afa0a0b598438c1e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-fm8w-2m5w-9j7r","aliases":["BIT-cilium-2026-56743","BIT-cilium-operator-2026-56743","BIT-hubble-relay-2026-56743","CVE-2026-56743","GO-2026-6367"],"title":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match","description":"### Impact\n\nStandard Kubernetes `NetworkPolicy` specifications using CIDR-based `ipBlock` rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule under specific cluster configurations.\n\nWhen Cilium deployment is configured with a specific custom `clusterName` (rather than the default `\"any\"` value), the parser incorrectly instantiates a pod selector on selectorless peer definitions. This leads to Cilium appending an unintended wildcard namespace label selector to the policy's allowed Layer 3 rules, which allows traffic from other workloads in the same namespace as the subject of the policy.\n\nExample policy affected by this issue:\n```\napiVersion: networking.k8s.io/v1\nkind: NetworkPolicy\nmetadata:\n  name: test-server\n  namespace: default\nspec:\n  podSelector:\n    matchLabels:\n      app: test-server\n  policyTypes:\n  - Ingress\n  ingress:\n  - from:\n    - ipBlock:\n        cidr: 192.0.2.3\n```\n\nIn affected versions, this policy erroneously allows the `test-server` Pod in the `default` namespace to receive any traffic from other workloads running in the `default` namespace.\n\n### Patches\n\nThis issue has been patched in:\n\n- Cilium v1.19.5\n\nReleases below v1.19.0 are not affected.\n\n### This issue affects:\n\n- Cilium v1.19 between v1.19.0 and v1.19.4 inclusive\n\n### Workarounds\n\nDevelopers can create the equivalent policy using CiliumNetworkPolicy [fromCIDR expressions](https://docs.cilium.io/en/stable/security/policy/layer3/#ip-cidr-based). CiliumNetworkPolicy and CiliumClusterwideNetworkPolicy are not affected by this issue.\n\n### Acknowledgements\n\nSpecial thanks to @TheBeeZee for reporting this issue and preparing the fix, and to @fristonio and @odinuge for their assistance in reviewing the solution.\n\n### For more information\n\nIf a vulnerability affecting Cilium appears to have been found, the Cilium security team strongly encourages reporting it to the security mailing list at security@cilium.io. This is a private mailing list for the Cilium security team, and the report will be treated as top priority.","state":0,"publishedAt":"2026-09-03T17:17:47+00:00","modifiedAt":"2026-09-10T15:25:32.738592+00:00","affected":[{"ecosystem":"Go","name":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.19.0"},{"kind":"fixed","version":"1.19.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r","https://nvd.nist.gov/vuln/detail/CVE-2026-56743","https://github.com/cilium/cilium/pull/46305","https://github.com/cilium/cilium/pull/46456","https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8","https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171","https://github.com/cilium/cilium","https://github.com/cilium/cilium/releases/tag/v1.19.5"],"sourceUrl":"https://github.com/advisories/GHSA-fm8w-2m5w-9j7r","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-fm8w-2m5w-9j7r","identifiers":["GHSA-fm8w-2m5w-9j7r","BIT-cilium-2026-56743","BIT-cilium-operator-2026-56743","BIT-hubble-relay-2026-56743","CVE-2026-56743","GO-2026-6367"]},"retained":false,"historicalAffected":[]},{"revision":"71340c07146c4877a78e190e47ae9b00","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6367","aliases":["BIT-cilium-2026-56743","BIT-cilium-operator-2026-56743","BIT-hubble-relay-2026-56743","CVE-2026-56743","GHSA-fm8w-2m5w-9j7r"],"title":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match in github.com/cilium/cilium","description":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match in github.com/cilium/cilium","state":0,"publishedAt":"2026-09-10T14:48:42+00:00","modifiedAt":"2026-09-10T15:25:32.738592+00:00","affected":[{"ecosystem":"Go","name":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.19.0"},{"kind":"fixed","version":"1.19.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r","https://nvd.nist.gov/vuln/detail/CVE-2026-56743","https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8","https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171","https://github.com/cilium/cilium/pull/46305","https://github.com/cilium/cilium/pull/46456","https://github.com/cilium/cilium/releases/tag/v1.19.5"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6367","license":"OSV · upstream source license applies","key":"osv:GO-2026-6367","identifiers":["GO-2026-6367","BIT-cilium-2026-56743","BIT-cilium-operator-2026-56743","BIT-hubble-relay-2026-56743","CVE-2026-56743","GHSA-fm8w-2m5w-9j7r"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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