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

Summary

### Impact The output of `cilium-bugtool` can contain sensitive data when the tool is run against Cilium deployments with WireGuard encryption enabled. Users of [WireGuard Transparent Encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/) are affected. The sensitive data is the WireGuard private key (`cilium_wg0.key`) used for node-to-node encrypted communication `cilium-bugtool` is a…

Product

go: github.com/cilium/cilium

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Related advisories