CVE-2026-41520

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 v3 7.9 HIGH

7.9^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.5 / Impact : 5.8

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/cilium/cilium/releases/tag/v1.17.15	Product Release Notes
https://github.com/cilium/cilium/releases/tag/v1.18.9	Product Release Notes
https://github.com/cilium/cilium/releases/tag/v1.19.3	Product Release Notes
https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:cilium:cilium::::::::
	cpe:2.3:a:cilium:cilium::::::::
	cpe:2.3:a:cilium:cilium::::::::

History

18 May 2026, 15:12

Type	Values Removed	Values Added
References	~~() https://github.com/cilium/cilium/releases/tag/v1.17.15 -~~	() https://github.com/cilium/cilium/releases/tag/v1.17.15 - Product, Release Notes
References	~~() https://github.com/cilium/cilium/releases/tag/v1.18.9 -~~	() https://github.com/cilium/cilium/releases/tag/v1.18.9 - Product, Release Notes
References	~~() https://github.com/cilium/cilium/releases/tag/v1.19.3 -~~	() https://github.com/cilium/cilium/releases/tag/v1.19.3 - Product, Release Notes
References	~~() https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj -~~	() https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj - Mitigation, Vendor Advisory
First Time		Cilium cilium Cilium
CPE		cpe:2.3:a:cilium:cilium::::::::

08 May 2026, 23:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-08 23:16

Updated : 2026-05-18 15:12

NVD link : CVE-2026-41520

Mitre link : CVE-2026-41520

CVE.ORG link : CVE-2026-41520

JSON object : View

Products Affected

cilium

cilium

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-312

Cleartext Storage of Sensitive Information

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