CVE-2026-62371 in KubeEdge
Summary
by MITRE • 09/21/2026
KubeEdge is an open source system for extending native containerized application orchestration capabilities to hosts at Edge. From 1.12.0 until 1.21.2, 1.22.2, and 1.23.1, the v1alpha2 NodeUpgradeJob handler in edge/pkg/taskmanager/actions/nodeupgradejob.go concatenates authenticated user-controlled spec.version and spec.image values into the keadm upgrade edge shell command. A user with permission to create or update NodeUpgradeJob resources can supply shell metacharacters in either field, causing arbitrary commands to execute on targeted edge nodes with the privileges of the upgrade process and compromising node confidentiality, integrity, and availability. This issue is fixed in versions 1.21.2, 1.22.2, and 1.23.1.
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Analysis
by VulDB Data Team • 09/21/2026
KubeEdge serves as a critical open-source system designed to extend native containerized application orchestration capabilities from central cloud environments down to hosts located at the network edge. This architecture allows for efficient management of IoT devices and edge computing nodes, ensuring that applications can run locally with low latency while remaining synchronized with centralized control planes. Within this ecosystem, the NodeUpgradeJob resource plays a pivotal role in managing software updates across distributed edge infrastructure. The vulnerability identified affects versions ranging from 1.12.0 through specific patched releases including 1.21.2, 1.22.2, and 1.23.1. During this period, the v1alpha2 NodeUpgradeJob handler located in the file edge/pkg/taskmanager/actions/nodeupgradejob.go contained a significant implementation flaw that compromised the security of the upgrade mechanism.
The core technical flaw stems from improper neutralization of special elements used in shell commands, commonly referred to as command injection or OS command injection. Specifically, when processing requests for node upgrades, the system concatenates user-controlled input fields, namely spec.version and spec.image, directly into a keadm upgrade edge shell command without adequate sanitization or validation. Because these inputs are derived from authenticated users who possess permissions to create or update NodeUpgradeJob resources, an attacker with legitimate access can inject shell metacharacters such as semicolons, pipes, or backticks into either the version or image fields. This allows the injection of arbitrary commands that are executed by the upgrade process on the targeted edge nodes. The concatenation occurs in a context where the operating system interprets these characters as command delimiters rather than literal data, thereby bypassing intended security boundaries.
The operational impact of this vulnerability is severe due to the elevated privileges associated with the node upgrade process. When an attacker successfully exploits this flaw, they achieve arbitrary code execution on the targeted edge nodes with the same privileges held by the upgrade service account or user running the keadm command. This results in a complete compromise of the confidentiality, integrity, and availability of the affected systems. Confidentiality is breached as attackers can exfiltrate sensitive data stored on the node. Integrity is compromised because malicious code can modify system files, install backdoors, or alter application configurations. Availability is impacted through denial-of-service attacks facilitated by resource exhaustion or deletion of critical system components. Given that edge nodes often manage physical infrastructure or industrial control systems, this compromise could have cascading effects on downstream operations and real-world processes dependent on these devices.
This vulnerability aligns with CWE-78, which describes Improper Neutralization of Special Elements used in an OS Command, highlighting the failure to properly sanitize user input before its inclusion in a command string. From a tactical perspective, this exploitation technique corresponds to ATT&CK T1059, specifically sub-techniques involving command and script interpreters such as Unix Shell or Windows CMD. The attack vector leverages existing authenticated credentials, classifying it under Initial Access techniques that abuse legitimate administrative functions rather than exploiting external network vulnerabilities directly. This distinction underscores the importance of defense-in-depth strategies where even trusted users are subject to strict input validation protocols.
To mitigate this risk and prevent similar issues in future deployments, organizations must ensure they upgrade their KubeEdge clusters to patched versions 1.21.2, 1.22.2, or 1.23.1 and later. For environments where immediate upgrading is not feasible, strict role-based access control should be implemented to limit who can create or update NodeUpgradeJob resources. Additionally, input validation mechanisms that reject any non-alphanumeric characters in the spec.version and spec.image fields would prevent the injection of shell metacharacters. Monitoring logs for unusual command execution patterns on edge nodes can also aid in early detection of exploitation attempts. Ultimately, treating all user-supplied data as untrusted until proven otherwise is essential to maintaining the security posture of distributed edge computing architectures.