critical severity October 21, 2026 · 1 min read

CISA ICS Advisory: Siemens Desigo, Gridscale

Here’s what this advisory affects, and what to do about it.

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

CISA ICS Advisory: Siemens Desigo, Gridscale

CISA published an ICS advisory on November 12, 2026, detailing the impact of a critical vulnerability in the Brotli decoder used by Node.js on multiple Siemens industrial control system products.

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Node.js Brotli out-of-bounds write

The advisory addresses CVE-2026-111497, known as Node2Shell. It is an out-of-bounds write in the Brotli decoder bundled with Node.js. Successful exploitation could allow a remote attacker to cause memory corruption and potentially execute arbitrary code.

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Affected products

The advisory examines the status of various Siemens software products that incorporate the vulnerable Node.js component. It specifically names versions of Siemens Desigo and Gridscale. Siemens has already released updated versions for the affected products.

What to do

Apply the latest Siemens updates for all instances of Desigo and Gridscale in use.
Determine whether any deployed Siemens systems are running versions that depend on the vulnerable Node.js Brotli implementation.
Follow Siemens’ official guidance on the newly released fixed versions.
Monitor Siemens’ product security channels for any additional updates related to this advisory.
Prioritise patching in environments where these systems are exposed to untrusted networks.

Organisations operating Siemens industrial control systems should treat this as a high-priority update because the underlying vulnerability resides in a widely used open-source component.

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Sources: CISA ICS Advisory

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