---
id: CVE-2026-100706
title: >-
  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
  Service…
summary: >-
  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
  Service…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-441
vendor: kyverno
product: kyverno
affected:
  - kyverno < 1.19.1
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:55.843'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100706'
references:
  - url: 'https://github.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2w'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/kyverno-before-1.19.1-privilege-escalation-via-policy-apicall-urlpath
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.898Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.