External risk intelligence

Apache Kylin SQL Injection and Missing Authentication Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64959

Apache Kylin is typically deployed as an internal analytical data warehouse or OLAP engine within protected corporate networks. While the service can be network-reachable, public internet exposure is uncommon and generally not the intended deployment pattern for this type of backend infrastructure, as noted in the bulletin.

SQL Injection

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability affects Apache Kylin, a technology used for data analysis. It allows for the execution of injected SQL commands due to missing authentication on certain backend cache APIs. While the impact is primarily on services directly exposed to the public network, which is uncommon for this type of system, the potential for data compromise is significant.

SQL injection risk in data analysis service.
Internal deployments likely unaffected; confirm relevance.
Focus on understanding Kylin's network exposure.

Attack Path

How an attacker could exploit the issue

An attacker could target Apache Kylin services that are directly exposed to the public network, though this is uncommon for typical in-house deployments. By exploiting a missing authentication check in certain backend cache APIs, an attacker could inject malicious SQL commands, potentially leading to the execution of arbitrary SQL code.

Exposed Kylin services are required.
Injected SQL commands trigger the vulnerability.
Leads to sensitive data exposure or modification.

Live Threat

Current exploitation, exposure, and threat context

When Kylin services are directly exposed to the public network, a missing authentication check in backend cache APIs could allow attackers to inject and execute SQL commands. This scenario is uncommon, and in-house Kylin deployments are generally not impacted.

SQL commands could be executed.
Direct public network exposure allows exploitation.
Unauthorized SQL execution may occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

Given that Apache Kylin is typically an internal analytical data warehouse, the primary responsibility likely falls to the platform or data engineering teams managing the Kylin instances. The first practical step is to identify all Kylin deployments, confirm if any are exposed to the public network (which is uncommon and the primary risk vector), and then determine the business criticality and accountable owner for any exposed instances before planning remediation.

Platform/Data Engineering teams own the issue.
Verify public network exposure and business criticality.
Plan upgrades for exposed instances.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is Apache Kylin?

Apache Kylin is an open-source distributed analytical engine and data warehouse. It is designed to provide SQL interfaces and multi-dimensional analysis (OLAP) on top of massive datasets, allowing users to query big data environments with high performance and low latency.

What does SQL injection mean for CVE-2026-64959?

This vulnerability involves two weaknesses: improper neutralization of special elements in SQL commands (CWE-89) and missing authentication for critical functions (CWE-306). Because the backend cache API fails to verify user identity, an attacker can submit specially crafted inputs that the database interprets as unauthorized commands, potentially leading to data theft or modification.

How can an attacker trigger this vulnerability?

An attacker exploits this by sending malicious requests to specific backend cache APIs that lack authentication checks. The vulnerability is not triggered by standard, authenticated user workflows; it specifically requires the system to be reachable by an unauthenticated party. If the API endpoint is restricted or properly guarded, the attack path is effectively blocked.

Is my deployment at risk according to Halo Surface Signal?

Halo Surface Signal labels this as unlikely for most organizations because Apache Kylin is traditionally used as an internal analytical tool. It is rarely deployed with direct exposure to the public internet. If your instance is isolated within a protected corporate network, the primary attack vector described in this CVE is significantly mitigated.

What should I do to address CVE-2026-64959?

Your first step is to inventory all Apache Kylin instances and confirm their network accessibility. Prioritize any instances that are accidentally exposed to the public internet for immediate attention. Once identified, coordinate with your data engineering team to upgrade the affected software from version 5.x to 5.0.5, which resolves the authentication and injection issues.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.