Summary
On October 21, 2026, the Node.js project released security updates addressing a critical vulnerability in the Brotli decoder bundled with Node.js, commonly referred to as "Node2Shell" (tracked as CVE-2026-111497). The vulnerability is an out-of-bounds write that could allow a remote attacker to cause memory corruption and potentially execute arbitrary code. This advisory covers the status of impact of various Siemens software products. Siemens has released new versions for the affected products and recommends to update to the latest versions.
The following versions of Siemens Desigo, Gridscale are affected:
- Desigo CC family V8 vers:all/* (CVE-2026-111497)
- Desigo CC family V9 vers:all/* (CVE-2026-111497)
- Gridscale X DSA vers:intdot/>=5.3|<5.4 (CVE-2026-111497)
-
Gridscale X PSS®E vers:intdot/<36.8.0 (CVE-2026-111497)
CVSS
Vendor
Equipment
v3 9.8
Siemens
Desigo CC family V8
1 Vulnerability
Out-of-bounds Write
Background
- Critical Infrastructure Sectors: Critical Manufacturing, Energy, Information Technology
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Germany
Vulnerabilities
CVE-2026-111497
A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream. Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.
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4 Affected Products
Desigo CC family V8
Product Status: known_affected, known_not_affected
Remediations
Vendor fix
Install the latest .NET security updates via Windows Update.
Desigo CC family V9
Product Status: known_affected, known_not_affected
Remediations
Vendor fix
Install the latest .NET security updates via Windows Update.
Gridscale X DSA >= V5.3 < V5.4
Product Status: known_affected, known_not_affected
Remediations
Vendor fix
Update to V5.4 or later version
Gridscale X PSS®E < V36.8.0
Product Status: known_affected, known_not_affected
Remediations
Vendor fix
Update to V36.8.0 or later version
Additional Metrics
Relevant CWE: CWE-787 Out-of-bounds Write
CVSS Version
Base Score
Base Severity
Vector String
3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Acknowledgments
- Siemens ProductCERT reported this vulnerability to CISA.
General Recommendations
Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can thus be minimized by virtue of the grid design. Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment. As a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment. Recommended security guidelines can be found at: https://www.siemens.com/gridsecurity
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.
- Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
- Locate control system networks and remote devices behind firewalls and isolating 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 current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also
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