{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56743","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-22T19:17:28.959Z","datePublished":"2026-07-15T19:15:30.924Z","dateUpdated":"2026-07-16T13:03:36.080Z"},"containers":{"cna":{"title":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match","problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r"},{"name":"https://github.com/cilium/cilium/pull/46305","tags":["x_refsource_MISC"],"url":"https://github.com/cilium/cilium/pull/46305"},{"name":"https://github.com/cilium/cilium/pull/46456","tags":["x_refsource_MISC"],"url":"https://github.com/cilium/cilium/pull/46456"},{"name":"https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8","tags":["x_refsource_MISC"],"url":"https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8"},{"name":"https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171","tags":["x_refsource_MISC"],"url":"https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171"},{"name":"https://github.com/cilium/cilium/releases/tag/v1.19.5","tags":["x_refsource_MISC"],"url":"https://github.com/cilium/cilium/releases/tag/v1.19.5"}],"affected":[{"vendor":"cilium","product":"cilium","versions":[{"version":">= 1.19.0, < 1.19.5","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-15T19:15:30.924Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-fm8w-2m5w-9j7r","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-16T13:02:42.889041Z","id":"CVE-2026-56743","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-16T13:03:36.080Z"}}]}}