High severity8.3NVD Advisory· Published Nov 9, 2026· Updated Nov 9, 2026
CVE-2026-19706
CVE-2026-19706
Description
During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation.
An attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access.
Exploitable only during the narrow bootstrap window.
Affected products
1Patches
Vulnerability mechanics
References
4- access.redhat.com/security/cve/CVE-2026-19706nvd
- bugzilla.redhat.com/show_bug.cginvd
- docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/indexnvd
- kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/nvd
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