high severity August 18, 2026 · 1 min read

CISA ICS Advisory: CISA Malcolm

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

Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition or execute arbitrary code.

On August 18, 2026, the Cybersecurity and Infrastructure Security Agency (CISA) released an ICS advisory detailing multiple vulnerabilities in Malcolm, an open-source network traffic analysis tool used in industrial control system environments.

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Denial-of-Service and Arbitrary Code Execution

The advisory states that successful exploitation of the vulnerabilities could allow an attacker to cause a denial-of-service condition or execute arbitrary code. CISA has not disclosed whether the flaws have been exploited in the wild.

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Affected Products

The advisory concerns Malcolm. It does not list specific version numbers or a precise list of affected releases. No particular industrial sectors or organizations are singled out beyond those that deploy Malcolm in operational technology or ICS networks.

What to Do

Determine whether your organization uses Malcolm for network monitoring in ICS or OT environments.
Review the full technical details and any available patches or workarounds published in the CISA advisory.
Apply updates from the Malcolm maintainers as soon as they become available.
Implement network segmentation and other compensating controls recommended for OT environments pending remediation.
Monitor the official Malcolm project repository and CISA’s ICS advisories for further updates.

Organizations operating industrial control systems should treat this advisory as a prompt to verify the presence and configuration of Malcolm within their environments.

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Sources: CISA ICS Advisory

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