kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the… (CVE-2026-100706)
Kyverno versions before 1.19.1 contain a critical vulnerability in the validation of URL-encoded path segments within the Policy apiCall urlPath. This flaw allows namespace tenants to bypass namespace restrictions and create objects in other namespaces using percent-encoded directory traversal sequences. Exploitation can lead to creation of MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, resulting in privilege escalation to cluster admin.
AI Analysis
Technical Summary
Kyverno before version 1.19.1 fails to properly validate URL-encoded path segments in the Policy apiCall urlPath parameter. This improper validation enables attackers with namespace tenant privileges to bypass per-namespace restrictions and create resources in other namespaces as the admission-controller ServiceAccount. By leveraging percent-encoded directory traversal sequences, attackers can create MutatingWebhookConfiguration objects across the cluster or PolicyException objects in the kyverno namespace, thereby escalating privileges to cluster administrator level.
Potential Impact
Successful exploitation allows attackers with limited namespace tenant privileges to bypass namespace isolation controls and create cluster-wide or kyverno namespace-specific objects. This leads to privilege escalation to cluster admin, potentially compromising the entire Kubernetes cluster's security and control.
Mitigation Recommendations
A fix is available in Kyverno version 1.19.1. Users should upgrade to version 1.19.1 or later to remediate this vulnerability. No other mitigation guidance is provided in the available data.
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the… (CVE-2026-100706)
Description
Kyverno versions before 1.19.1 contain a critical vulnerability in the validation of URL-encoded path segments within the Policy apiCall urlPath. This flaw allows namespace tenants to bypass namespace restrictions and create objects in other namespaces using percent-encoded directory traversal sequences. Exploitation can lead to creation of MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, resulting in privilege escalation to cluster admin.
CVSS v3.1
Score 9.9critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Kyverno before version 1.19.1 fails to properly validate URL-encoded path segments in the Policy apiCall urlPath parameter. This improper validation enables attackers with namespace tenant privileges to bypass per-namespace restrictions and create resources in other namespaces as the admission-controller ServiceAccount. By leveraging percent-encoded directory traversal sequences, attackers can create MutatingWebhookConfiguration objects across the cluster or PolicyException objects in the kyverno namespace, thereby escalating privileges to cluster administrator level.
Potential Impact
Successful exploitation allows attackers with limited namespace tenant privileges to bypass namespace isolation controls and create cluster-wide or kyverno namespace-specific objects. This leads to privilege escalation to cluster admin, potentially compromising the entire Kubernetes cluster's security and control.
Mitigation Recommendations
A fix is available in Kyverno version 1.19.1. Users should upgrade to version 1.19.1 or later to remediate this vulnerability. No other mitigation guidance is provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-j68q-wq49-88gg
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100706"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6ab89bd7f7a7c54106941ff4
Added to database: 09/27/2026, 04:30:15 UTC
Last enriched: 09/27/2026, 04:40:46 UTC
Last updated: 09/28/2026, 01:47:40 UTC
Views: 18
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