Vulnerability Description
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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2w
- https://www.vulncheck.com/advisories/kyverno-before-1.19.1-privilege-escalation-
FAQ
What is CVE-2026-100706?
CVE-2026-100706 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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 namespace...
How severe is CVE-2026-100706?
CVE-2026-100706 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-100706?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.