CVE-2026-56742
Published:July 15, 2026
Updated:August 04, 2026
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 Packages
https://github.com/cilium/cilium.git (GITHUB):
Affected version(s) >=v1.18.0 <v1.18.11Fix Suggestion:
Update to version v1.18.11https://github.com/cilium/cilium.git (GITHUB):
Affected version(s) >=v1.19.0 <v1.19.5Fix Suggestion:
Update to version v1.19.5https://github.com/cilium/cilium.git (GITHUB):
Affected version(s) >=v1.17.0 <v1.17.17Fix Suggestion:
Update to version v1.17.17github.com/cilium/cilium (GO):
Affected version(s) >=v1.18.0 <v1.18.11Fix Suggestion:
Update to version v1.18.11github.com/cilium/cilium (GO):
Affected version(s) >=v1.19.0 <v1.19.5Fix Suggestion:
Update to version v1.19.5github.com/cilium/cilium (GO):
Affected version(s) >=v1.17.0 <v1.17.17Fix Suggestion:
Update to version v1.17.17Related Resources (10)
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Contact UsCVSS v4
Base Score:
4.8
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
LOW
CVSS v3
Base Score:
5.9
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Missing Authorization
EPSS
Base Score:
0.17