SEPTEMBER 9, 2026
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Case File

CVE-2026-56742

MEDIUM · CVSS 5.9 EPSS 0.17% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-15 · Last synced 2026-08-14

CyberRota Analysis

AI-Generated

Cilium clusters prior to specified versions are vulnerable to a flaw that allows users with permissions to create or update namespaced HTTPRoutes to redirect HTTP traffic to any Service across namespaces, circumventing the ReferenceGrant authorization controls. This could lead to unauthorized access and data exposure within the network. Organizations utilizing Cilium, especially those with Gateway API enabled, should prioritize upgrading to the patched versions to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-56742
Severity
MEDIUM
CVSS
5.9
EPSS
0.17%

Original NVD 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.

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