Executive Summary

CVE-2026-6264 is a critical security vulnerability affecting Talend JobServer and Talend Runtime. It allows unauthenticated remote code execution through the JMX monitoring port of the Talend JobServer. This means an attacker can execute arbitrary code on the affected system without needing any credentials or user interaction.

The vulnerability can be mitigated by requiring TLS client authentication on the JMX monitoring port for Talend JobServer, or by disabling the JobServer JMX monitoring port for Talend Runtime (which is disabled by default from version 8.0 R2024-07-RT). However, full mitigation requires applying official patches released in January 2026.

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Impact Analysis

This vulnerability poses a severe risk of full system compromise. Because it allows unauthenticated remote code execution, an attacker can gain complete control over the affected Talend JobServer or Runtime environment.

• Confidentiality impact: High - sensitive data could be accessed or stolen.
• Integrity impact: High - attacker can modify or corrupt data and system configurations.
• Availability impact: High - attacker can disrupt or disable services.

Overall, exploitation could lead to unauthorized access, data breaches, service outages, and potentially further attacks within the network.

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Mitigation Strategies

To mitigate the vulnerability in Talend JobServer, enforce TLS client authentication on the JMX monitoring port.

For Talend Runtime, disable the JobServer JMX monitoring port, which is disabled by default from version 8.0 R2024-07-RT.

Full remediation requires applying the official patches released on January 16, 2026 for Talend JobServer (TPS-6017 for 8.0 and TPS-6018 for 7.3) and January 24, 2026 for Talend Runtime (8.0.1.R2026-01-RT and 7.3.1-R2026-01).

Users are strongly advised to upgrade to these patched versions immediately to prevent exploitation.

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Compliance Impact

This vulnerability allows unauthenticated remote code execution with high impact on confidentiality, integrity, and availability, which could lead to unauthorized access and data breaches.

Such security weaknesses can negatively affect compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and maintaining system integrity and availability.

Failure to mitigate this vulnerability by applying patches or enforcing TLS client authentication could result in non-compliance due to potential exposure of personal or protected health information.

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Detection Guidance

The vulnerability involves unauthenticated remote code execution via the JMX monitoring port of the Talend JobServer. Detection can focus on identifying if the JMX monitoring port is open and accessible without TLS client authentication.

You can scan your network or system to check if the JMX monitoring port (commonly 1099 or a configured port for JMX) is open and accepting connections without TLS client authentication.

Example commands to detect the open JMX port include:

• Using nmap to scan for open JMX ports: nmap -p 1099 <target-ip>
• Using telnet or nc (netcat) to test connectivity: telnet <target-ip> 1099 or nc -vz <target-ip> 1099

If the port is open and accessible without TLS client authentication, the system is vulnerable unless patched or mitigated.

Full mitigation requires applying the official patches or disabling the JMX monitoring port on Talend Runtime.

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