CVE-2026-18621 in AI Inference Server
Summary
by MITRE • 08/11/2026
A flaw was found in Data Science Pipelines (DSP). An attacker with namespace editor privileges can bypass security hardening by submitting a malicious Argo Workflow through the V1 API path. This allows the API server to create pods with elevated privileges, acting as a 'confused deputy' on behalf of the attacker. Successful exploitation grants the attacker node-root access, enabling arbitrary code execution and full control over the underlying node.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability exists within Data Science Pipelines (DSP) where a security flaw allows privilege escalation through the V1 API path. The issue stems from insufficient validation mechanisms that permit malicious Argo Workflow submissions to bypass established security controls. When an attacker with namespace editor privileges submits a crafted workflow, the system fails to properly validate the request parameters, creating an opportunity for unauthorized privilege elevation.
The technical implementation of this vulnerability involves a confused deputy attack pattern where the API server inadvertently acts as an intermediary for malicious operations. The flaw manifests when the V1 API endpoint processes workflow submissions without adequate sanitization or authorization checks. This allows the attacker to manipulate the workflow definition in such a way that submitted pods are created with elevated privileges beyond what should be permitted for namespace editors.
The operational impact of this vulnerability is severe as it enables attackers to achieve node-root access through the compromised API endpoint. Once successfully exploited, the attacker gains full control over the underlying compute node, allowing arbitrary code execution and complete system compromise. This represents a critical escalation from the initial namespace editor privileges to system-level access, effectively breaking down the security boundaries that should protect the cluster.
Security hardening mechanisms are bypassed through improper input validation and inadequate privilege separation within the DSP architecture. The vulnerability demonstrates a failure in the principle of least privilege enforcement, where the API server fails to properly validate or sanitize workflow parameters that could lead to privilege escalation. This flaw essentially creates an attack vector that allows malicious actors to leverage legitimate system interfaces for unauthorized operations.
The mitigation strategy should focus on implementing robust input validation at the V1 API endpoint level with strict parameter sanitization and authorization checks. Security controls must enforce proper privilege boundaries and prevent the creation of pods with elevated privileges through workflow submissions. Additionally, the system should implement comprehensive monitoring and logging of workflow submissions to detect anomalous behavior patterns that could indicate attempted exploitation attempts.
This vulnerability aligns with CWE-285 (Improper Authorization) and CWE-798 (Use of Hard-coded Credentials) categories while demonstrating characteristics of ATT&CK technique T1068 (Exploitation for Privilege Escalation) and T1059 (Command and Scripting Interpreter). The attack pattern represents a classic confused deputy problem where legitimate system components are manipulated to perform unauthorized actions. Organizations should implement comprehensive security testing including privilege escalation scenarios and ensure proper separation of duties within their pipeline orchestration systems to prevent similar vulnerabilities from being exploited in production environments.