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CVE-2026-56742

5.9 · MEDIUM

Cilium is a networking, observability, and security solution.

Published Jul 15, 2026CWE-862EPSS 0.17%

Overview

CVE-2026-56742 is a medium-severity vulnerability. It was published on July 15, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333debGitHubgithub.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857GitHubgithub.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032bGitHubgithub.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512caGitHubgithub.com/cilium/cilium/releases/tag/v1.17.17GitHubgithub.com/cilium/cilium/releases/tag/v1.18.11GitHubgithub.com/cilium/cilium/releases/tag/v1.19.5GitHubgithub.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-56742?

CVE-2026-56742 is a medium-severity vulnerability. It was published on July 15, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-56742?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-56742?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-56742?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-56742 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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