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CVE-2026-56742 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.9 HIGHVector:CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb	[email protected]	Patch
https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857	[email protected]	Patch
https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b	[email protected]	Patch
https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca	[email protected]	Patch
https://github.com/cilium/cilium/releases/tag/v1.17.17	[email protected]	Release Notes
https://github.com/cilium/cilium/releases/tag/v1.18.11	[email protected]	Release Notes
https://github.com/cilium/cilium/releases/tag/v1.19.5	[email protected]	Release Notes
https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj	[email protected]	Vendor Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-862	Missing Authorization	[email protected]

Affected Products

Product	Versions
cilium cilium	< 1.17.17 >= 1.18.0, < 1.18.11 >= 1.19.0, < 1.19.5
CPE cpe:2.3:a:cilium:cilium:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 17, 2026	Initial Analysis	[email protected]
Jul 16, 2026	CVE Modified	CISA-ADP
Jul 15, 2026	New CVE Received	[email protected]