What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• cilium: before 1.17.15; from 1.18.0 before 1.18.9; from 1.19.0 before 1.19.3 — fixed in 1.17.15, 1.18.9, 1.19.3

How to fix

Upgrade to a fixed version: cilium 1.17.15, 1.18.9, 1.19.3. Check the vendor advisory for mitigations.

References

• https://github.com/cilium/cilium/releases/tag/v1.17.15
• https://github.com/cilium/cilium/releases/tag/v1.18.9
• https://github.com/cilium/cilium/releases/tag/v1.19.3
• https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj

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