CVE-2026-100707: Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
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.
Affected Software
Event History
Frequently Asked Questions
Which Kyverno versions require remediation?
Kyverno versions before 1.19.1 are affected. Upgrade to 1.19.1 or later.
What level of access does an attacker need?
An attacker needs low-privilege tenant access sufficient to use a namespaced Policy resource with an apiCall context entry. No user interaction is required.
What can an attacker obtain through this issue?
The bypass can allow reading resources in other namespaces through the Kyverno admission controller's ServiceAccount credentials. The accessible data is limited by the permissions assigned to those credentials.