{"id":"BIT-cilium-2026-56743","summary":"Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match","details":"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.","aliases":["BIT-cilium-operator-2026-56743","BIT-hubble-relay-2026-56743","CVE-2026-56743","GHSA-fm8w-2m5w-9j7r","GO-2026-6367"],"modified":"2026-09-10T15:25:32.738592014Z","published":"2026-07-19T23:37:52.609Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8"},{"type":"FIX","url":"https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171"},{"type":"FIX","url":"https://github.com/cilium/cilium/pull/46305"},{"type":"FIX","url":"https://github.com/cilium/cilium/pull/46456"},{"type":"ARTICLE","url":"https://github.com/cilium/cilium/releases/tag/v1.19.5"},{"type":"ADVISORY","url":"https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56743"}],"affected":[{"package":{"name":"cilium","ecosystem":"Bitnami","purl":"pkg:bitnami/cilium"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.19.0"},{"fixed":"1.19.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/cilium/BIT-cilium-2026-56743.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"}]}],"schema_version":"1.9.0"}