CVE-2026-41520 HIGH

CVE-2026-41520: Cillium exposes sensitive information included in the cilium-bugtool debug archive

Vendor Cilium
Product cilium
Weakness CWE-200 · Info exposure
Published May 8, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

7.9/10
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 13, 2026 Record updated