Cilium L7 proxy may bypass Kubernetes NetworkPolicy for same-node traffic

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-33726 · CVE overview and exploitation status

EUVD-2026-16503

GHSA-hxv8-4j4r-cqgv

BIT-cilium-2026-33726

BIT-cilium-operator-2026-33726

BIT-hubble-relay-2026-33726

GO-2026-4856

cve-program · CVE-2026-33726

• https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv
• https://github.com/cilium/cilium/pull/44693
• https://docs.cilium.io/en/stable/network/concepts/routing/#routing
• https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy
• https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management
• https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing

euvd · EUVD-2026-16503

• https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv
• https://github.com/cilium/cilium/pull/44693
• https://docs.cilium.io/en/stable/network/concepts/routing/#routing
• https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy
• https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management
• https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing

nvd · CVE-2026-33726

• https://docs.cilium.io/en/stable/network/concepts/routing/#routing
• https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy
• https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management
• https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing
• https://github.com/cilium/cilium/pull/44693
• https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv

osv · GHSA-hxv8-4j4r-cqgv

• https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv
• https://nvd.nist.gov/vuln/detail/CVE-2026-33726
• https://github.com/cilium/cilium/pull/44693
• https://docs.cilium.io/en/stable/network/concepts/routing/#routing
• https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy
• https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management
• https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing
• https://github.com/cilium/cilium

osv · GO-2026-4856

• https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv
• https://github.com/cilium/cilium/pull/44693
• https://docs.cilium.io/en/stable/network/concepts/routing/#routing
• https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy
• https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management
• https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing

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