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
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
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.