CVE-2026-124440 Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-124440?
CVE-2026-124440 is a critical vulnerability in kyverno, published on 8 Nov 2026.
Official 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.
Weakness: CWE-441
Which versions are affected by CVE-2026-124440?
How do I fix CVE-2026-124440?
No fix has been published for CVE-2026-124440 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-124440 being exploited?
There is no known exploitation of CVE-2026-124440 in the wild and no public exploit code.
Sources
Also known as GHSA-39w8-hv5g-f73w, GHSA-xvrq-w385-5mfv.