CVE-2026-124440 Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass
CriticalCVSS 9.4
- Published
- Updated
- Exploit status
- No public exploit known
Description
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kyverno | >= 1.19.1, < 1.19.2 | 1.19.2 |
References
- GitHub Security Advisory (GHSA-39w8-hv5g-f73w) vendor-advisory
- VulnCheck Advisory: Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass third-party-advisory