Kubernetes (kubelet, kube-controller-manager): Mehrere Schwachstellen
WID-SEC-2026-3544 · first 24.09.2026 · updated 27.10.2026 · CVSS 5,9
What it is about
Kubernetes ist ein Werkzeug zur Automatisierung der Bereitstellung, Skalierung und Verwaltung von containerisierten Anwendungen. Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Kubernetes ausnutzen, um Sicherheitsvorkehrungen zu umgehen und vertrauliche Informationen offenzulegen.
Under what conditions?
Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.
What can happen in the worst case
An attacker could use the vulnerability to
- Sicherheitsvorkehrungen zu umgehen
- vertrauliche Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Open Source Kubernetes kubelet <1.34.12
- Open Source Kubernetes kubelet <1.35.9
- Open Source Kubernetes kubelet <1.36.5
- Open Source Kubernetes kubelet <1.37.1
- Open Source Kubernetes kube-controller-manager <1.34.12
- Open Source Kubernetes kube-controller-manager <1.35.9
- Open Source Kubernetes kube-controller-manager <1.36.5
- Open Source Kubernetes kube-controller-manager <1.37.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Kubernetes kubelet 1.34.12
- Open Source Kubernetes kubelet 1.35.9
- Open Source Kubernetes kubelet 1.36.5
- Open Source Kubernetes kubelet 1.37.1
- Open Source Kubernetes kube-controller-manager 1.34.12
- Open Source Kubernetes kube-controller-manager 1.35.9
- Open Source Kubernetes kube-controller-manager 1.36.5
- Open Source Kubernetes kube-controller-manager 1.37.1
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Issue vom 2026-09-23 github.com
- GitHub Issue vom 2026-09-23 github.com
- Kubernetes Security Advisory vom 2026-09-23 discuss.kubernetes.io
- Kubernetes Security Advisory vom 2026-09-23 discuss.kubernetes.io
CVE: CVE-2026-2270, CVE-2026-76654
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.