CVE-2026-56742CWE-862

Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

Medium · published July 15, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
6.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00172 · 6.3th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-07-15T19:14Z
EPSS history
Timeline
  • 15 JUL 19:14Z
    Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
    cvelistv5