CVE-2026-33726Cilium is a networking, observability, and security solution with an eBPF-based dataplane.
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Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.17.14, 1.18.8, and 1.19.2, Ingress Network Policies are not enforced for traffic from pods to L7 Services (Envoy, GAMMA) with a local backend on the same node, when Per-Endpoint Routing is enabled and BPF Host Routing is disabled. Per-Endpoint Routing is disabled by default, but is automatically enabled in deployments using cloud IPAM, including Cilium ENI on EKS (`eni.enabled`), AlibabaCloud ENI (`alibabacloud.enabled`), Azure IPAM (`azure.enabled`, but not AKS BYOCNI), and some GKE deployments (`gke.enabled`; managed offerings such as GKE Dataplane V2 may use different defaults). It is typically not enabled in tunneled deployments, and chaining deployments are not affected. In practice, Amazon EKS with Cilium ENI mode is likely the most common affected environment. Versions 1.17.14, 1.18.8, and 1.19.2 contain a patch. There is currently no officially verified or comprehensive workaround for this issue. The only option would be to disable per-endpoint routes, but this will likely cause disruptions to ongoing connections, and potential conflicts if running in cloud providers.
- CVSS
- 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-284, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cilium cilium cilium:cilium | before 1.17.14; from 1.18.0 before 1.18.8; from 1.19.0 before 1.19.2 | NVD |
References
- https://docs.cilium.io/en/stable/network/concepts/routing/#routingtechnical-description
- https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policytechnical-description
- https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-managementtechnical-description
- https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routingtechnical-description
- https://github.com/cilium/cilium/pull/44693issue-tracking, patch
- https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgvpatch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.