CVE-2026-56742

EUVD-2026-44773
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
5.9 MEDIUM
ADJACENT_NETWORK
LOW
HIGH
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
ciliumcilium
𝑥
< 1.17.17
CNA
Common Weakness Enumeration
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
https://github.com/cilium/cilium/releases/tag/v1.18.11
https://github.com/cilium/cilium/releases/tag/v1.19.5
https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj