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Vulnerability · Published May 8, 2026 · Assigned by GitHub_M

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

High 7.9

In plain English

A high-severity information exposure in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.9High
Exploit odds (30 days)<0.1%top 99.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/cilium/cilium1.17.15GHSA-gj49-89wh-h4gj
Gogithub.com/cilium/cilium1.18.9GHSA-gj49-89wh-h4gj
Gogithub.com/cilium/cilium1.19.3GHSA-gj49-89wh-h4gj
Gogithub.com/cilium/cilium1.17.15, 1.18.9, 1.19.3GO-2026-5400

Affected products (as reported)

VendorProductVersions
cilium cilium < 1.17.15>= 1.18.0, < 1.18.9>= 1.19.0, < 1.19.3

Weakness: CWE-200, CWE-312 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

References