Auth bypass in Cilium
CVE-2026-33726
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…
EPSS: 0.000 (1.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Cilium — versions < 1.17.14, >= 1.18.0, < 1.18.8, >= 1.19.0, < 1.19.2
Weakness classification (CWE)
References
- https://github.com/cilium/cilium/security/advisories/GHSA-hxv8-4j4r-cqgv (x_refsource_CONFIRM)
- https://github.com/cilium/cilium/pull/44693 (x_refsource_MISC)
- https://docs.cilium.io/en/stable/network/concepts/routing/#routing (x_refsource_MISC)
- https://docs.cilium.io/en/stable/network/kubernetes/policy/#network-policy (x_refsource_MISC)
- https://docs.cilium.io/en/stable/network/servicemesh/l7-traffic-management (x_refsource_MISC)
- https://docs.cilium.io/en/stable/operations/performance/tuning/#ebpf-host-routing (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33726?
- CVE-2026-33726 is a medium-severity vulnerability in Cilium, classified under Improper Access Control. CVSS score: 5.4/10. Published 2026-03-27.
- How severe is CVE-2026-33726?
- Medium severity. CVSS v3 base score is 5.4 out of 10.