kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath (CVE-2026-100706) | HOL Guard CVE

Critical · CVSS 9.4CVE-2026-100706

kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

Answer in brief

CVE-2026-100706 records a Critical severity (CVSS 9.4) vulnerability in kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath. The current sources do not mark it as known exploited. The current feed maps kyverno/kyverno (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 26, 2026Updated Sep 26, 2026Source checked Sep 26, 2026First seen by HOL Sep 26, 2026Material review Sep 26, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps kyverno/kyverno (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
kyverno/kyvernogeneric	>=0 <1.19.1	1.19.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for kyverno/kyverno.
Review the reported fix. Update kyverno/kyverno to 1.19.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 26, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.