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[ CVE-2026-56742 · Published 15 Jul 2026 ]

Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

CVSS 5.9 EPSS <1%Fix available

[ Description ]Official description

Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.

[ Fixes ]Fixes and patches

[ Packages ]Affected open-source packages

  • github.com/cilium/cilium goAffected < 1.17.17 · fixed in 1.17.17 · GHSA-w7c2-w76w-5hmj
  • github.com/cilium/ciliumCilium goAffected >= 1.18.0, < 1.18.11 · fixed in 1.18.11 · GHSA-w7c2-w76w-5hmj
  • github.com/cilium/cilium goAffected >= 1.19.0, < 1.19.5 · fixed in 1.19.5 · GHSA-w7c2-w76w-5hmj

[ References ]References