CVE-2026-124440
Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
Kyverno from 1.19.1 before 1.19.2 contains an authorization bypass vulnerability in the apiCall namespace clamp that allows namespace tenants to issue cross-namespace and cluster-scoped API requests by appending malformed percent-escapes to urlPath. Attackers can create namespaced Policies whose apiCall runs as the admission-controller ServiceAccount to read other namespaces' resources and create mutating webhooks, escalating to cluster admin.
| CWE | CWE-441 |
| Vendor | kyverno |
| Product | kyverno |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
kyverno / kyverno
1.19.1 < 1.19.2
References
Credits
WarlordSam07