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
Probability:
Percentile:
Meta Information
Published
2026-05-08
Last Modified
2026-05-18
Generated
2026-06-19
AI Q&A
2026-05-09
EPSS Evaluated
2026-06-18
NVD
CVE-2026-41520
Affected Vendors & Products
Showing 3 associated CPEs
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
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-312 The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
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.

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.

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.

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.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-41520. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart