CVE-2026-56742

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment with an admin-level account. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-07-15 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-17 17:48 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-07-15 20:17 UTC

Last modified

2026-07-17 17:48 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-862 · Missing authorization

Record status

Analyzed

Affected

• Cilium < 1.17.17
• Cilium < 1.18.11
• Cilium < 1.19.5

Attack profile CVSS 3.1 · 5.9

Attack vector

Adjacent network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-56742.md and follow it. Check whether this project is affected by CVE-2026-56742. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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