Hitachi Energy MACH HiDraw RCE via CVE-2026-7310 — Patch Guide

A new advisory from the Cybersecurity and Infrastructure Security Agency (CISA) highlights a security flaw in Hitachi Energy’s MACH HiDraw, a specialized software suite used in the management and configuration of critical infrastructure. The vulnerability, tracked as CVE-2026-7310, is a heap-based buffer overflow that could lead to RCE. According to CISA Advisory ICSA-26-155-05, the flaw resides in the application’s XML parser functionality.

Technical Analysis of CVE-2026-7310

The vulnerability is classified under CWE-122: Heap-based Buffer Overflow. It occurs when the software attempts to write data beyond the boundaries of a heap-allocated buffer during the processing of XML files. To exploit this, an authenticated malicious user with local access must convince a legitimate user to open a specially crafted XML file. Because the exploit relies on a malformed file, the TTP involves user interaction, which is reflected in its CVSS score of 5.5.

Hitachi Energy MACH HiDraw version 9.22 buffer overflow

This specific Hitachi Energy MACH HiDraw version 9.22 buffer overflow poses a unique risk in Operational Technology (OT) environments. While the attacker requires local access, such access is often the secondary goal of a multi-stage attack involving Phishing or the compromise of an engineering workstation. Once local access is achieved, the attacker can leverage this CVE to trigger memory corruption. This corruption can lead to two primary outcomes: an application crash, resulting in a denial-of-service condition for the management interface, or the execution of arbitrary code with the privileges of the application. In the context of the MITRE ATT&CK framework, this aligns with Exploitation for Privilege Escalation or User Execution.

Impact on Critical Infrastructure Sectors

Hitachi Energy MACH HiDraw is utilized worldwide, primarily within the Energy, Dams, and Transportation Systems sectors. These industries represent vital components of national infrastructure. A failure in the MACH HiDraw system could disrupt the monitoring or configuration of high-voltage equipment. If an attacker achieves code execution, they could potentially facilitate Lateral Movement across the control network, moving from the engineering workstation to more sensitive industrial controllers. This could jeopardize the confidentiality and integrity of the process control data, leading to operational instability.

ICS XML parser vulnerability mitigation

Defenders must prioritize ICS XML parser vulnerability mitigation to prevent exploitation. The vendor, Hitachi Energy, has released version 9.23 to address this flaw. Due to the complexity of industrial control implementations, organizations are advised to contact their local account teams to coordinate the upgrade process. For the SOC and network administrators, several general defensive measures should be enforced until patching is complete:

• Network Isolation: Ensure that all control system devices are isolated from the business network and have no direct internet connectivity.
• Physical Security: Restrict physical access to workstations to authorized personnel only to prevent local file-based exploits.
• Least Privilege: Follow strict password policies and limit administrative privileges on machines running the MACH HiDraw software to reduce the risk of Privilege Escalation.
• Email and Web Hygiene: Prohibit the use of control system workstations for internet browsing or receiving emails, which are common vectors for delivering malicious XML payloads.

To effectively learn how to mitigate CVE-2026-7310 exploit attempts, organizations should adopt a Zero Trust architecture, ensuring that every user and device is verified before interacting with critical configuration tools. Scanning all portable media for malware before connecting them to the control network is also a mandatory practice for maintaining a secure environment.