CVE-2026-56742
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Jul 15, 2026
Vendor
unknown
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.
References
- https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb
- https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857
- https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b
- https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca
- https://github.com/cilium/cilium/releases/tag/v1.17.17