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CVE-2026-26963: Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

February 19, 2026 (updated February 20, 2026)

Host Policies will incorrectly permit traffic from Pods on other nodes when all of the following configurations are enabled:

  • Native Routing
  • WireGuard
  • Node Encryption (beta)

These options are disabled by default in Cilium.

References

  • github.com/advisories/GHSA-5r23-prx4-mqg3
  • github.com/cilium/cilium
  • github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885
  • github.com/cilium/cilium/pull/42892
  • github.com/cilium/cilium/releases/tag/v1.18.6
  • github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3
  • nvd.nist.gov/vuln/detail/CVE-2026-26963

Code Behaviors & Features

Detect and mitigate CVE-2026-26963 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 1.18.0 before 1.18.6

Fixed versions

  • 1.18.6

Solution

Upgrade to version 1.18.6 or above.

Impact 6.1 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-863: Incorrect Authorization

Source file

go/github.com/cilium/cilium/CVE-2026-26963.yml

Spotted a mistake? Edit the file on GitLab.

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