Information disclosure in Cilium

CVE-2026-41520

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 deploymen…

Vulnerability class: Information Disclosure

EPSS: 0.000 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.9 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N.

Affected products

  • Cilium — versions < 1.17.15, >= 1.18.0, < 1.18.9, >= 1.19.0, < 1.19.3

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-41520?
CVE-2026-41520 is a high-severity vulnerability in Cilium, classified under Information Disclosure. CVSS score: 7.9/10. Published 2026-05-08.
How severe is CVE-2026-41520?
High severity. CVSS v3 base score is 7.9 out of 10.