Moderate severityNVD Advisory· Published Feb 19, 2026· Updated Feb 20, 2026
Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled
CVE-2026-26963
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/cilium/ciliumGo | >= 1.18.0, < 1.18.6 | 1.18.6 |
Affected products
6- osv-coords5 versionspkg:bitnami/ciliumpkg:bitnami/cilium-operatorpkg:bitnami/hubble-relaypkg:golang/github.com/cilium/ciliumpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
>= 1.18.0, < 1.18.6+ 4 more
- (no CPE)range: >= 1.18.0, < 1.18.6
- (no CPE)range: >= 1.18.0, < 1.18.6
- (no CPE)range: >= 1.18.0, < 1.18.6
- (no CPE)range: >= 1.18.0, < 1.18.6
- (no CPE)range: < 0.0.20260226T182644-150000.1.149.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-5r23-prx4-mqg3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-26963ghsaADVISORY
- github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885ghsax_refsource_MISCWEB
- github.com/cilium/cilium/pull/42892ghsax_refsource_MISCWEB
- github.com/cilium/cilium/releases/tag/v1.18.6ghsax_refsource_MISCWEB
- github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3ghsax_refsource_CONFIRMWEB
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