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

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.1EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

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