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CVE-2026-100706

kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

CVSS 4.0 9.4 CRITICALCVSS 3.1 9.9 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-100706

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-100706

Published

kyverno

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "kyverno",
                    "product": "kyverno",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:golang/github.com/kyverno/kyverno",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.19.1"
                        },
                        {
                            "version": "1.19.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON