CVE-2026-56742: 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…

PriorityP353high8.9CVSS 3.1

AVAACLPRLUINSCCHIHAL

EPSS

0.28%

20.2th percentile

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.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
cilium	cilium	< 1.17.17	1.17.17
cilium	cilium	—	—
cilium	cilium	—	—
cilium	cilium	>= 1.18.0 < 1.18.11	1.18.11
cilium	cilium	>= 1.19.0 < 1.19.5	1.19.5

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