CVE-2026-41520: Cilium

Medium severity, CVSS 4.4. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Cilium Cilium: before 1.17.15 (fixed in 1.17.15); from 1.18.0, before 1.18.9 (fixed in 1.18.9); from 1.19.0, before 1.19.3 (fixed in 1.19.3)

Published 2026-05-08. Last modified 2026-06-17.