CVE-2026-100706

Critical

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.

SeverityCritical

CVSS9.9

Exploit probability—

ProductKyverno

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-441CWE-441

How to fix

Update

kyverno kyverno1.19.1 or later

Vendor advisories

github.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2w

Affected products

Product	Affected versions	Fixed in
kyverno kyverno	v < 1.19.1	1.19.1

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