XZ Utils vulnerability impacting B&R Products

Summary

A critical vulnerability (CVE-2025-31115) has been identified in XZ Utils versions affecting multiple B&R Industrial Automation products. Exploitation can lead to product crashes and memory data corruption. The vulnerability stems from a race condition in the multithreaded .xz decoder within liblzma. B&R has released updates for the affected product versions, and users are advised to apply them promptly.

Full text

ICS Advisory XZ Utils vulnerability impacting B&R Products Release DateJune 30, 2026 Alert CodeICSA-26-181-05 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary An update is available that resolves vulnerability in the product versions listed as affected in the advisory. An attacker who successfully exploited this vulnerability could cause the product to stop or corrupt memory data. The following versions of XZ Utils vulnerability impacting B&R Products are affected: PPC3100 <1.8.1, 1.8.1 (CVE-2025-31115) C50 <1.8.0, 1.8.0 (CVE-2025-31115) C80 <1.8.0, 1.8.0 (CVE-2025-31115) FT50 <1.8.1, 1.8.1 (CVE-2025-31115) MT50 <1.8.1, 1.8.1 (CVE-2025-31115) T30 <1.8.0, 1.8.0 (CVE-2025-31115) T80 <1.8.0, 1.8.0 (CVE-2025-31115) T50 <1.8.1, 1.8.1 (CVE-2025-31115) CVSS Vendor Equipment Vulnerabilities v3 7.5 B&R Industrial Automation GmbH XZ Utils vulnerability impacting B&R Products Race Condition within a Thread Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Switzerland Vulnerabilities Expand All + CVE-2025-31115 XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases. View CVE Details Affected Products XZ Utils vulnerability impacting B&R Products Vendor:B&R Industrial Automation GmbH Product Version:B&R Industrial Automation GmbH PPC3100 <1.8.1, B&R Industrial Automation GmbH C50 <1.8.0, B&R Industrial Automation GmbH C80 <1.8.0, B&R Industrial Automation GmbH FT50 <1.8.1, B&R Industrial Automation GmbH MT50 <1.8.1, B&R Industrial Automation GmbH T30 <1.8.0, B&R Industrial Automation GmbH T80 <1.8.0, B&R Industrial Automation GmbH T50 <1.8.1 Product Status:fixed, known_affected Remediations Vendor fixThe problem is corrected in the following product versions: Product Terminal OS Version - PPC3100 1.8.1 - C50 1.8.0 - C80 1.8.0 - FT50 1.8.1 - MT50 1.8.1 - T30 1.8.0 - T80 1.8.0 - T50 1.8.1 B&R recommends that customers apply the update at earliest convenience. The process to install updates is described in the user manual. The step to identify the installed product version is described in the user manual. MitigationRefer to section “General security recommendations” for further advise on how to keep your system secure Relevant CWE: CWE-366 Race Condition within a Thread Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Acknowledgments ABB PSIRT reported this vulnerability to CISA. Notice The information in this document is subject to change without notice, and should not be construed as a commitment by B&R. B&R provides no warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, for the information contained in this document, and assumes no responsibility for any errors that may appear in this document. In no event shall B&R or any of its suppliers be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, or from the use of any hardware or software described in this document, even if B&R or its suppliers have been advised of the possibility of such damages. This document and parts hereof must not be reproduced or copied without written permission from B&R, and the contents hereof must not be imparted to a third party nor used for any unauthorized purpose. All rights to registrations and trademarks reside with their respective owners. Frequently asked questions Could the vulnerability be exploited remotely? - Yes, an attacker who has network access to an affected system node could exploit this vulnerability. Recommended practices include that process control systems are physically protected, have no direct connections to the Internet, and are separated from other networks by means of a firewall system that has a minimal number of ports exposed. When this security advisory was issued, had this vulnerability been publicly disclosed? - Yes, this vulnerability has been publicly disclosed. When this security advisory was issued, had B&R received any reports that this vulnerability was being exploited? - No, B&R had not received any information indicating that this vulnerability had been exploited when this security advisory was originally issued. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. Advisory Conversion Disclaimer This ICSA is a verbatim republication of ABB PSIRT SA26P009 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact ABB PSIRT directly for any questions regarding this advisory. Revision History Initial Release Date: 2026-06-10 Date Revision Summary 2026-06-10 1 Initial version. 2026-06-30 2 Initial CISA Republication of ABB PSIRT SA26P009 advisory Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor B&RABB Tags Sector: Critical Manufacturing Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Jun 30, 2026 ICS Advisory | ICSA-26-181-01 Mitsubishi Ele

Indicators of Compromise

• cve — CVE-2025-31115

Entities