Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| cilium | cilium | >= 1.18.0, < 1.18.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | golang-github-cilium-ebpf | No fix yet | — |
| Ubuntu 26.04 LTS | golang-github-cilium-ebpf | No fix yet | — |
| Ubuntu 25.10 | golang-github-cilium-ebpf | No fix yet | — |
| Ubuntu 24.04 LTS | golang-github-cilium-ebpf | No fix yet | — |
| Ubuntu 22.04 LTS | golang-github-cilium-ebpf | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260226T182644-150000.1.149.1 | SUSE-SU-2026:0757-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/cilium/cilium | >= 1.18.0, < 1.18.6 | 1.18.6 | GHSA-5r23-prx4-mqg3 |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0757-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 4, 2026