CVE-2026-101919 Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane
An authenticated user can achieve arbitrary code execution in the control plane by injecting malicious plugins into unsanitized kubeconfig secrets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101919?
CVE-2026-101919 is a high-severity code injection vulnerability in Red Hat Multicluster Engine for Kubernetes, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in the HyperShift operator. The operator copies user-provided Kubernetes configuration (kubeconfig) secrets directly into the privileged control plane namespace without proper validation or sanitization. An authenticated user with cluster and secret creation permissions can exploit this vulnerability by supplying a configuration containing unauthorized executable plugins. When downstream controllers consume this configuration, an attacker can achieve arbitrary code execution within the control plane.
Weakness: CWE-20
Which versions are affected by CVE-2026-101919?
How do I fix CVE-2026-101919?
No fix has been published for CVE-2026-101919 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-101919 being exploited?
There is no known exploitation of CVE-2026-101919 in the wild and no public exploit code.
Sources
Also known as GHSA-9pmf-w27v-pwpg.