Apache Kylin OS Command Injection via Job Config Parameters

Technical Analysis

The vulnerability (CVE-2026-62392) stems from improper neutralization of special elements (CWE-78) in job configuration parameters passed to backend APIs, which are subsequently incorporated into OS command execution without adequate sanitization or escaping. An attacker able to submit job configuration values through Kylin's API could inject shell metacharacters to achieve arbitrary command execution with the privileges of the Kylin service process, potentially leading to full host compromise, lateral movement, or data exfiltration from underlying Hadoop/HBase data stores. The CVSS 9.8 score indicates likely network-based attack vector, low complexity, and no privileges or user interaction required, making this highly exploitable. Organizations running Kylin as part of analytics pipelines that feed data to AI agents or RAG systems face elevated risk: a compromised Kylin host could allow attackers to poison analytical data used downstream by LLM tool-use pipelines, exfiltrate API keys or credentials stored on the host, or pivot into agent orchestration infrastructure connected to the same network segment.

Affected Systems

Apache Kylin versions 4.0.0 through 5.0.3, including all deployment modes exposing job configuration APIs; systems remain vulnerable until upgraded to 5.0.4.

Indicators of Compromise

• No public IOCs available at this time; monitor Kylin job submission logs for anomalous shell metacharacters (e.g., ;, |, &&, $(), backticks) in job configuration parameters.

Remediation Steps

1. 1

   Upgrade Apache Kylin

   Immediately upgrade all Apache Kylin deployments to version 5.0.4 or later, which contains the fix for this OS command injection vulnerability.

2. 2

   Restrict API access

   Limit network exposure of Kylin's backend job configuration APIs to trusted internal networks and enforce authentication/authorization controls.

3. 3

   Input validation and WAF rules

   Deploy web application firewall rules to detect and block shell metacharacters in job configuration parameter submissions as a temporary mitigation until patching is complete.

4. 4

   Audit and monitor logs

   Review Kylin job execution logs and system command history for signs of exploitation, including unexpected process spawns or outbound connections from the Kylin host.

5. 5

   Isolate and harden hosts

   Run Kylin services with least-privilege service accounts and network segmentation to limit blast radius if command injection is successfully exploited.