CVE-2026-26963

Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

CVSS 6.1 MEDIUMEPSS 0.1%CWE-863

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

cilium · cilium

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References

https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885 https://github.com/cilium/cilium/pull/42892 https://github.com/cilium/cilium/releases/tag/v1.18.6 https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3