CVE-2026-41520

Received Received - Intake

Information Disclosure in Cilium via cilium-bugtool

Publication date: 2026-05-08

Last updated on: 2026-05-18

Assigner: GitHub, Inc.

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-08

Last Modified

2026-05-18

Generated

2026-07-09

AI Q&A

2026-05-09

EPSS Evaluated

2026-07-08

NVD

CVE-2026-41520

Affected Vendors & Products

Vendor	Product	Version / Range
cilium	cilium	to 1.17.15 (exc)
cilium	cilium	From 1.18.0 (inc) to 1.18.9 (exc)
cilium	cilium	From 1.19.0 (inc) to 1.19.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-312	The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This vulnerability affects Cilium, a networking, observability, and security solution that uses an eBPF-based dataplane. Before versions 1.17.15, 1.18.9, and 1.19.3, the output of the cilium-bugtool could include sensitive data if the tool was run on Cilium deployments with WireGuard encryption enabled. This means that sensitive information could be exposed unintentionally through diagnostic outputs.

Mitigation Strategies

To mitigate this vulnerability, upgrade Cilium to versions 1.17.15, 1.18.9, or 1.19.3 or later, where the issue has been patched.

Impact Analysis

The vulnerability can lead to the exposure of sensitive data when using the cilium-bugtool on affected Cilium deployments with WireGuard encryption enabled. This could compromise confidentiality and potentially allow attackers or unauthorized users to access sensitive information that should have been protected.

Compliance Impact

The vulnerability in Cilium's cilium-bugtool prior to versions 1.17.15, 1.18.9, and 1.19.3 can lead to exposure of sensitive data when run against deployments with WireGuard encryption enabled.

Exposure of sensitive data can potentially impact compliance with data protection regulations such as GDPR and HIPAA, which require protection of sensitive information and mandate controls to prevent unauthorized disclosure.

However, the provided information does not specify exact compliance impacts or regulatory assessments related to this vulnerability.

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