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CVE PROGRAM SOURCE RECORD5.9 Medium

CVE-2026-56742

Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

cilium cilium

  • < 1.17.17affected
  • >= 1.18.0, < 1.18.11affected
  • >= 1.19.0, < 1.19.5affected

References