CVE-2026-41520
High
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.
SeverityHigh
CVSS7.9
Exploit probability—
ProductCilium
PublishedMay 8, 2026
First seenMay 8, 2026
Weakness typeCWE-200Sensitive information exposureCWE-312CWE-312
How to fix
Update
- cilium cilium1.17.15, 1.18.9, 1.19.3 or later
- github.com/cilium/cilium1.17.15, 1.18.9, 1.19.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cilium cilium | v < 1.17.15, 1.18.0 ≤ v < 1.18.9, 1.19.0 ≤ v < 1.19.3 | 1.17.15, 1.18.9, 1.19.3 |
| github.com/cilium/ciliumGo | v < 1.17.15, 1.18.0 ≤ v < 1.18.9, 1.19.0 ≤ v < 1.19.3 | 1.17.15, 1.18.9, 1.19.3 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.