--- title: Charmed Kubernetes update for upstream API server vulnerability description: An upstream Kubernetes vulnerability (CVE-2019-11247) has been identified where the API server mistakenly allows access to a cluster-scoped custom resource, if the request is made as if the resource were namespaced. Authorisations for the resource accessed in this manner are enforced using roles and role bindings within the namespace. Thi […] url: https://canonical.com/blog/charmed-kubernetes-update-for-upstream-api-server-vulnerability?format=md --- 1. [Blog](https://canonical.com/blog) 2. Article --- [Canonical](https://canonical.com/blog/author/canonical "More about Canonical") 5 August 2019 # Charmed Kubernetes update for upstream API server vulnerability [Charmed Kubernetes](https://canonical.com/blog/tag/charmed-kubernetes) [CVE](https://canonical.com/blog/tag/cve) [kubernetes](https://canonical.com/blog/tag/kubernetes) [Security](https://canonical.com/blog/tag/security) --- Share the article An upstream Kubernetes vulnerability (CVE-2019-11247) has been identified where the API server mistakenly allows access to a cluster-scoped custom resource, if the request is made as if the resource were namespaced. Authorisations for the resource accessed in this manner are enforced using roles and role bindings within the namespace. This means that a user with access only to a resource in one namespace could create, view updates or delete the cluster-scoped resource (according to their namespace role privileges). [Charmed Kubernetes](https://ubuntu.com/kubernetes) has already been patched to mitigate against this vulnerability. Patched builds of the 1.13.8, 1.14.4 and 1.15.1 [kube-apiserver](https://snapcraft.io/kube-apiserver) snap have also been published. The vulnerability, of medium severity, has also been patched in the following upstream version of Kubernetes – 1.13.9, 1.14.5 and 1.15.2. Users are encouraged to update to one of these versions now. To mitigate against the vulnerability in an unpatched version, users should remove authorisation rules that grant access to cluster-scoped resources within namespaces. For example, RBAC roles and clusterroles intended to be referenced by rolebindings should not grant access to `resources:[\*], apiGroups:[\*]`, or grant access to cluster-scoped custom resources. More information can be found on the [Knowledge Base](https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/k8s-CVE-2019-11247). ## Sign up for our newsletter Get the latest Canonical news and updates in your inbox. Work email: \*I agree to receive information about Canonical's products and services. By submitting this form, I confirm that I have read and agree to [Canonical's Privacy Policy](https://canonical.com/legal/dataprivacy). Sign up ## Share on --- ## Related posts [### Canonical joins the Open Secure AI Alliance](https://canonical.com/blog/open-secure-ai-alliance) Canonical is now part of the Open Secure AI Alliance, announced by NVIDIA with partners across cloud computing, cybersecurity, enterprise software, open source foundations, and... [Canonical](https://canonical.com/blog/author/canonical) 28 August 2026 [### Januscape vulnerability CVE-2026-53359 mitigations available](https://canonical.com/blog/januscape-linux-vulnerability-mitigations-available) Introduction A local privilege escalation (LPE) vulnerability affecting the Linux kernel was publicly disclosed on July 6, 2026. The vulnerability was assigned CVE ID... [seth-arnold](https://canonical.com/blog/author/seth-arnold) 11 July 2026 [### DirtyClone Linux kernel local privilege escalation vulnerability fixes available](https://canonical.com/blog/dirtyclone-linux-vulnerability-fixes-available) On June 25, 2026, JFrog published their research into CVE-2026-43503, referring to the vulnerability as DirtyClone. The vulnerability had previously been responsibly disclosed... [Luci Stanescu](https://canonical.com/blog/author/lucistanescu) 1 July 2026 [### pedit COW kernel local privilege escalation vulnerability mitigations](https://canonical.com/blog/pedit-cow-linux-vulnerability-fixes-available) Mitigations are available for the Linux vulnerability with CVE ID CVE-2026-46331. The CVE ID was assigned on June 16 2026 and highlighted as a local privilege escalation (LPE)... [Luci Stanescu](https://canonical.com/blog/author/lucistanescu) 1 July 2026