Critical Kibana Vulnerability Enable Heap Corruption and Remote Code Execution

A critical security vulnerability has been identified in Elastic’s Kibana platform that enables attackers to execute heap corruption and potentially achieve remote code execution through specially crafted HTML pages.

The vulnerability, designated as CVE-2025-2135 and detailed in Elastic Security Advisory ESA-2025-09, affects a wide range of Kibana versions and carries a critical CVSS score of 9.9, indicating severe potential impact for organizations relying on Kibana for data visualization and analytics.

The security flaw stems from a type confusion vulnerability within Chromium’s rendering engine, which Kibana utilizes for its PDF and PNG reporting features.

Google announced the underlying Chromium vulnerability on March 10, 2025, which attackers can exploit to corrupt heap memory through maliciously crafted HTML pages.

This type confusion occurs when the system incorrectly interprets data types, leading to memory corruption that can be leveraged for arbitrary code execution.

The vulnerability’s critical severity rating of 9.9 on the CVSSv3.1 scale reflects its potential for widespread impact.

The attack vector is network-based with low complexity requirements, meaning attackers can exploit the vulnerability remotely without requiring extensive technical sophistication.

The scope is classified as “Changed,” indicating that successful exploitation can affect resources beyond the vulnerable component itself, potentially compromising the entire Kibana deployment and associated systems.

What makes this vulnerability particularly concerning is its integration with Kibana’s reporting functionality, which is commonly used in enterprise environments for generating dashboards, visualizations, and analytical reports.

Organizations that regularly use PDF or PNG report generation are at heightened risk, as these features directly invoke the vulnerable Chromium components during the rendering process.

Affected Systems and Configurations

The vulnerability impacts multiple generations of Kibana deployments across both self-hosted and cloud-based environments. Affected versions include:

• Kibana 7.x series: Versions up to and including 7.17.28.
• Kibana 8.0.x – 8.17.x: Versions 8.0.0 through 8.17.7.
• Kibana 8.18.x: Versions 8.18.0 through 8.18.2.
• Kibana 9.0.x: Versions 9.0.0 through 9.0.2.

Vulnerable configurations specifically include:

• Self-hosted Kibana instances with PDF or PNG reporting enabled.
• Elastic Cloud deployments utilizing PDF or PNG reporting capabilities.
• Systems where users actively generate visual reports through Kibana’s interface.

Non-affected systems include:

• CSV reporting functionality (remains secure).
• Elastic Serverless projects (completely unaffected).
• Kibana instances with reporting features disabled.

For Elastic Cloud users, while the vulnerability exists, Elastic has implemented additional security measures that limit the potential impact.

The company notes that code execution remains confined within the Kibana Docker container, with container escape attempts prevented through seccomp-bpf and AppArmor security profiles.

These defensive measures significantly reduce the risk of lateral movement and system-wide compromise in cloud-hosted environments.

Mitigations

Elastic strongly recommends immediate upgrading to patched versions as the primary remediation strategy.

Secure versions include Kibana 7.17.29, 8.17.8, 8.18.3, and 9.0.3, which contain fixes for the underlying Chromium vulnerability.

Organizations should prioritize these updates, especially those heavily relying on PDF and PNG reporting features.

For organizations unable to immediately upgrade, several mitigation options are available. The most comprehensive approach involves disabling the reporting feature entirely by adding xpack.reporting.enabled: false to the kibana.yml configuration file.

This completely eliminates the attack vector but may impact business operations dependent on automated reporting.

Alternative mitigations include restricting PDF and PNG report generation to trusted user accounts only, effectively reducing the potential for malicious exploitation.

Organizations can also implement restrictive network policies for reporting functions, though this requires careful configuration to maintain legitimate reporting connectivity while preventing unauthorized redirections to attacker-controlled sites.

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