Cilium up to 1.17.14/1.18.8/1.19.2 information disclosure

Summaryinfo

A vulnerability was found in Cilium up to 1.17.14/1.18.8/1.19.2 and classified as problematic. This affects an unknown part. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-41520. The attack must be carried out locally. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cilium up to 1.17.14/1.18.8/1.19.2 and classified as problematic. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.17.15, 1.18.9, and 1.19.3, the output of cilium-bugtool can contain sensitive data when the tool is run against Cilium deployments with WireGuard encryption enabled. This issue has been patched in versions 1.17.15, 1.18.9, and 1.19.3.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-41520 since 04/20/2026. The exploitation is known to be easy. The attack needs to be approached locally. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 1.17.15, 1.18.9 or 1.19.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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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
• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3
• 1.18.4
• 1.18.5
• 1.18.6
• 1.18.7
• 1.18.8
• 1.19.0
• 1.19.1
• 1.19.2

Website

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

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CPE 2.2info

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