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.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
cilium cilium affected
Version Status Constraints
< 1.17.17 affected —
>= 1.18.0, < 1.18.11 affected —
>= 1.19.0, < 1.19.5 affected —

No data.

No data.

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Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb cve-icon
https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857 cve-icon
https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b cve-icon
https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca cve-icon
https://github.com/cilium/cilium/releases/tag/v1.17.17 cve-icon
https://github.com/cilium/cilium/releases/tag/v1.18.11 cve-icon
https://github.com/cilium/cilium/releases/tag/v1.19.5 cve-icon
https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj cve-icon
History

Wed, 15 Jul 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Cilium
Cilium cilium
Vendors & Products Cilium
Cilium cilium

Wed, 15 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-15T19:14:07.617Z

Reserved: 2026-06-22T19:17:28.959Z

Link: CVE-2026-56742

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-15T22:00:06Z

Weaknesses