CVE-2026-124440 (GCVE-0-2026-124440)
Vulnerability from cvelistv5 – Published: 2026-11-08 13:15 – Updated: 2026-11-09 14:25
VLAI
EPSS
VEX
Title
Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass
Summary
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.
Severity
9.9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 14:25 UTC
CWE
- CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/kyverno/kyverno/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/kyverno-1.19… | third-party-advisory |
Impacted products
Date Public
2026-10-23 00:00
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