Is CVE-2026-56742 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-56742?

CVE-2026-56742 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-56742

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.