CVE-2026-32241
HighSummary
Flannel, sieć dla kontenerów w Kubernetes, ma w wersjach przed 0.28.2 podatność na wstrzykiwanie poleceń w eksperymentalnym backendzie Extension. Atakujący mogą uzyskać dostęp do wykonania dowolnych poleceń na każdym węźle flannel w klastrze, jeśli mogą ustawić adnotacje węzła Kubernetes.
Risk Assessment
Organizacje korzystające z Flannel w wersjach przed 0.28.2 narażają się na poważne ryzyko, ponieważ atakujący mogą uzyskać dostęp do systemu na poziomie root na wszystkich węzłach flannel w klastrze.
Recommendation
Zaleca się aktualizację Flannel do wersji v0.28.2 lub użycie innego backendu, takiego jak vxlan lub wireguard, aby zminimalizować ryzyko.
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Original NVD description (English source)
Flannel is a network fabric for containers, designed for Kubernetes. The Flannel project includes an experimental Extension backend that allows users to easily prototype new backend types. In versions of Flannel prior to 0.28.2, this Extension backend is vulnerable to a command injection that allows an attacker who can set Kubernetes Node annotations to achieve root-level arbitrary command execution on every flannel node in the cluster. The Extension backend's SubnetAddCommand and SubnetRemoveCommand receive attacker-controlled data via stdin (from the `flannel.alpha.coreos.com/backend-data` Node annotation). The content of this annotation is unmarshalled and piped directly to a shell command without checks. Kubernetes clusters using Flannel with the Extension backend are affected by this vulnerability. Other backends such as vxlan and wireguard are unaffected. The vulnerability is fixed in version v0.28.2. As a workaround, use Flannel with another backend such as vxlan or wireguard.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS