Cilium up to 1.17.16/1.18.10/1.19.4 Gateway API permission

Summaryinfo

A vulnerability, which was classified as problematic, was found in Cilium up to 1.17.16/1.18.10/1.19.4. Affected by this issue is some unknown functionality of the component Gateway API. Executing a manipulation can lead to permission. This vulnerability is tracked as CVE-2026-56742. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Cilium up to 1.17.16/1.18.10/1.19.4. It has been declared as problematic. This vulnerability affects some unknown functionality of the component Gateway API. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality. CVE summarizes:

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 advisory is available at github.com. This vulnerability was named CVE-2026-56742 since 06/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

Upgrading to version 1.17.17, 1.18.11 or 1.19.5 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Cilium

Version

• 1.17.0
• 1.17.1
• 1.17.2
• 1.17.3
• 1.17.4
• 1.17.5
• 1.17.6
• 1.17.7
• 1.17.8
• 1.17.9
• 1.17.10
• 1.17.11
• 1.17.12
• 1.17.13
• 1.17.14
• 1.17.15
• 1.17.16
• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3
• 1.18.4
• 1.18.5
• 1.18.6
• 1.18.7
• 1.18.8
• 1.18.9
• 1.18.10
• 1.19.0
• 1.19.1
• 1.19.2
• 1.19.3
• 1.19.4

Website

• Product: https://github.com/cilium/cilium/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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