Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path (CVE-2026-100707) | HOL Guard CVE

High · CVSS 8.3CVE-2026-100707

Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

Answer in brief

CVE-2026-100707 records a High severity (CVSS 8.3) vulnerability in Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path. 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: High · CVSS 8.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.3. 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 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.

Quoted source text, attributed separately from HOL analysis.