EUVD-2026-22037Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable endpoint with low-complexity injection; PR:L reflects authenticated/low-privileged access implied by the CVSS vector, yielding total host compromise (C/I/A all High).
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionCVE.org
The /registercrd endpoint in KubePlus 4.14 in the kubeconfiggenerator component is vulnerable to command injection. The component uses subprocess.Popen() with shell=True parameter to execute shell commands, and the user-supplied chartName parameter is directly concatenated into the command string without any sanitization or validation. An attacker can inject arbitrary shell commands by crafting a malicious chartName parameter value.
AnalysisAI
Command injection in KubePlus 4.14's kubeconfiggenerator component allows an attacker to run arbitrary shell commands on the host by supplying a crafted chartName value to the /registercrd endpoint. The flaw stems from unsanitized concatenation into a subprocess.Popen(..., shell=True) call, yielding full code execution (SSVC technical impact: total). A public proof-of-concept exists, but EPSS is very low (0.04%) and it is not on CISA KEV, so no public exploit indicates active exploitation at time of analysis.
Technical ContextAI
KubePlus is a Kubernetes add-on/operator that packages and delivers multi-instance applications as Helm-chart-based CRDs, giving consumers scoped kubeconfigs. The vulnerable kubeconfiggenerator microservice exposes an HTTP /registercrd endpoint that takes a chartName parameter and passes it into a Python subprocess.Popen() invocation with shell=True. Because the parameter is string-concatenated into the shell command line with no escaping, allow-listing, or validation, shell metacharacters (;, |, $(), backticks) are interpreted by the shell. This is a textbook CWE-94 (Improper Control of Generation of Code / code injection) manifesting as OS command injection - the root cause is trusting user input as part of an interpreted command string rather than passing arguments as a safe list without a shell.
RemediationAI
No vendor-released patch or fixed version has been identified at time of analysis, so apply compensating controls: restrict network access to the kubeconfiggenerator service and its /registercrd endpoint so it is only reachable by trusted control-plane components (NetworkPolicy or ingress rules), and require strong authentication/authorization in front of it. As a code-level fix once the vendor issues an update, the concatenated subprocess.Popen(..., shell=True) call should be replaced with an argument-list invocation without a shell and strict allow-list validation of chartName; until then, if operationally acceptable, disable or gate the CRD self-registration workflow that reaches this endpoint. Monitor the KubePlus project repository and https://nvd.nist.gov/vuln/detail/CVE-2026-29955 for an official fixed release, and cross-check any claimed fix against the researcher POC (https://github.com/b0b0haha/CVE-2026-29955). Each control has trade-offs: locking down the endpoint may break tenant self-service chart registration, and disabling the workflow removes that automation entirely.
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External POC / Exploit Code
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