CVE-2026-100706: Kyverno

Critical severity, CVSS 9.9. EPSS: 0.6% chance of exploitation in the next 30 days.

kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

Affected products

• Kyverno Kyverno: before 1.19.1 (fixed in 1.19.1)

Published 2026-09-26. Last modified 2026-09-28.