Command Injection Vulnerability in KubeEdge NodeUpgradeJob

KubeEdge versions within the 1.21.x, 1.22.x, and 1.23.x release branches contain a command injection vulnerability (CVE-2026-62371) affecting the NodeUpgradeJob resource handler within the v1alpha2 API. The vulnerability arises because the controller concatenates user-supplied values from the 'spec.version' and 'spec.image' fields directly into a shell string used to invoke 'keadm upgrade edge'. An attacker with the ability to create or update NodeUpgradeJob resources can inject shell metacharacters into these fields, resulting in arbitrary code execution on the target edge node with the privileges of the KubeEdge upgrade process. This issue represents a significant risk for deployments where API access is shared with untrusted entities, as it allows for container escape or host-level compromise of edge computing infrastructure.

Attack Chain

1. An attacker gains authenticated access to the KubeEdge cluster with permissions to manage NodeUpgradeJob resources.
2. The attacker crafts a malicious payload using shell metacharacters (e.g., ';', '&&', or '$()').
3. The attacker submits an update or create request to the v1alpha2 API for a NodeUpgradeJob resource.
4. The malicious shell metacharacters are embedded within the 'spec.version' or 'spec.image' YAML fields.
5. The KubeEdge controller processes the resource and dynamically builds the upgrade command using shell-based concatenation.
6. The system executes the resulting command string via the OS shell, triggering the payload.
7. The injected code executes on the target edge node, granting the attacker arbitrary command execution capabilities.

Impact

Successful exploitation of CVE-2026-62371 grants authenticated attackers the ability to execute arbitrary commands on edge nodes. Given that edge nodes often operate in distributed environments with access to local hardware or sensitive data, this can lead to total node compromise, persistent backdooring of edge infrastructure, and lateral movement into the broader KubeEdge ecosystem. The vulnerability impacts KubeEdge deployments versions 1.12.0 through 1.23.0, excluding specific patched releases.

Recommendation

1. Upgrade KubeEdge instances to version 1.21.2, 1.22.2, or 1.23.1 to address CVE-2026-62371.
2. Implement strict Kubernetes Role-Based Access Control (RBAC) to limit the ability to create or update NodeUpgradeJob resources to authorized administrators only.
3. Audit cluster logs for unusual modifications to NodeUpgradeJob objects that include unexpected shell special characters in version or image fields.