Kyverno up to 1.19.0 Policy urlPath path traversal

Summaryinfo

A vulnerability was found in Kyverno up to 1.19.0. It has been declared as critical. This vulnerability affects unknown code of the component Policy. Executing a manipulation of the argument urlPath can lead to path traversal. This vulnerability is registered as CVE-2026-100706. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Kyverno up to 1.19.0 and classified as critical. This vulnerability affects some unknown processing of the component Policy. The manipulation of the argument urlPath with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-100706 since 09/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.19.1 eliminates this vulnerability.

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Productinfo

Name

• Kyverno

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19.0

Website

• Product: https://github.com/kyverno/kyverno/

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