High severity7.9GHSA Advisory· Published May 8, 2026· Updated May 18, 2026
CVE-2026-41520
CVE-2026-41520
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/cilium/ciliumGo | < 1.17.15 | 1.17.15 |
github.com/cilium/ciliumGo | >= 1.18.0, < 1.18.9 | 1.18.9 |
github.com/cilium/ciliumGo | >= 1.19.0, < 1.19.3 | 1.19.3 |
Affected products
18- osv-coords17 versionspkg:apk/chainguard/hubble-fipspkg:apk/chainguard/hubble-ui-backendpkg:apk/chainguard/hubble-ui-backend-fipspkg:apk/chainguard/kubescapepkg:apk/chainguard/kubescape-operatorpkg:apk/chainguard/kubescape-operator-fipspkg:apk/chainguard/kubescape-serverpkg:apk/chainguard/kubescape-server-downloaderpkg:apk/chainguard/kubescape-server-fipspkg:apk/chainguard/kubescape-server-fips-downloaderpkg:apk/wolfi/hubble-ui-backendpkg:apk/wolfi/kubescapepkg:apk/wolfi/kubescape-operatorpkg:bitnami/ciliumpkg:bitnami/cilium-operatorpkg:bitnami/hubble-relaypkg:golang/github.com/cilium/cilium
< 1.18.6-r7+ 16 more
- (no CPE)range: < 1.18.6-r7
- (no CPE)range: < 0.13.5-r1
- (no CPE)range: < 0.13.5-r1
- (no CPE)range: < 4.0.5-r3
- (no CPE)range: < 0.2.140-r1
- (no CPE)range: < 0.2.140-r1
- (no CPE)range: < 4.0.9-r0
- (no CPE)range: < 4.0.9-r0
- (no CPE)range: < 4.0.6-r1
- (no CPE)range: < 4.0.6-r1
- (no CPE)range: < 0.13.5-r1
- (no CPE)range: < 4.0.5-r3
- (no CPE)range: < 0.2.140-r1
- (no CPE)range: < 1.17.15
- (no CPE)range: < 1.17.15
- (no CPE)range: < 1.17.15
- (no CPE)range: < 1.17.15
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-gj49-89wh-h4gjghsaADVISORY
- github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gjnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-41520ghsaADVISORY
- docs.cilium.io/en/stable/security/network/encryption-wireguardghsaWEB
- github.com/cilium/cilium/releases/tag/v1.17.15nvdProductRelease NotesWEB
- github.com/cilium/cilium/releases/tag/v1.18.9nvdProductRelease NotesWEB
- github.com/cilium/cilium/releases/tag/v1.19.3nvdProductRelease NotesWEB
News mentions
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