CVE-2026-56742
Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
- State
- Published
- Severity
- 5.9 Medium
- Published
- Jul 15, 2026
- Updated
- Jul 16, 2026
- Reserved
- Jun 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.9 Medium | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L | GitHub_M |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
ciliumcilium |
|
References
- https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj
- 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
- https://github.com/cilium/cilium/releases/tag/v1.18.11
- https://github.com/cilium/cilium/releases/tag/v1.19.5
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