CVE-2026-29773 kubewarden-controller cross-namespace data exfiltration via deprecated host callback binding
Attackers with specific policy creation permissions can read Ingress, Namespace, and Service resources across namespaces via deprecated APIs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29773?
CVE-2026-29773 is a medium-severity missing authorization vulnerability in kubewarden-controller, published on 9 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kubewarden is a policy engine for Kubernetes. Kubewarden cluster operators can grant permissions to users to deploy namespaced AdmissionPolicies and AdmissionPolicyGroups in their Namespaces. One of Kubewarden promises is that configured users can deploy namespaced policies in a safe manner, without privilege escalation. An attacker with privileged "AdmissionPolicy" create permissions (which isn't the default) could make use of 3 deprecated host-callback APIs: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. The attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively. This attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three.
Weakness: CWE-863
Which versions are affected by CVE-2026-29773?
3 open source packages ship an affected version, including github.com/kubewarden/kubewarden-controller. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/kubewarden/kubewarden-controller Go | All versions | 1.33.0 |
github.com/kubewarden/kubewarden-controller Go | All versions | 1.33.0 |
github.com/kubewarden/kubewarden-controller Go | All versions | 1.33.0 |
Products include Linuxfoundation Kubewarden.
How do I fix CVE-2026-29773?
Upgrade github.com/kubewarden/kubewarden-controller to 1.33.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-29773 being exploited?
There is no known exploitation of CVE-2026-29773 in the wild and no public exploit code.
Sources
Also known as GHSA-6r7f-3fwq-hq74, GO-2026-4652.