CISA Malcolm

August 18, 2026·Source: CISA

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TL;DR

View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition or execute arbitrary code. The following versions of CISA Malcolm are affected: Malcolm <26.06.1 (CVE-2026-55676) Malcolm <26.07.0 (CVE-2026-63133, CVE-2026-63134, CVE-2026-63177) Malcolm <=26.07.1 (CVE-2026-19670, CVE-2026-19671) CVSS Vendor Equipment Vulnerabilities

v3 8.8 CISA CISA Malcolm Allocation of Resources Without Limits or Throttling, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Unrestricted Upload of File with Dangerous Type, Incorrect Authorization, Improper Handling of Highly Compressed Data (Data Amplification)

Background Critical Infrastructure Sectors: Information Technology Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-63133 Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, safe-extract.py extracts uploaded archives with no limit on entry count, directory depth, total entries, or output size. A small malicious archive containing a large number of directory or file entries causes the filebeat processing container to create an unbounded number of filesystem objects, exhausting inodes or filesystem metadata and denying service to the processing pipeline and any service sharing the same mount. Version 26.07.0 fixes the issue. View CVE Details Affected Products CISA Malcolm Vendor: CISA Product Version: CISA Malcolm: <26.07.0 Product Status: known_affected Remediations Vendor fix Malcolm version 26.07.0 addresses these issues. For more information, see https://github.com/cisagov/Malcolm/pull/1043. (CVE-2026-63133, CVE-2026-63134, CVE-2026-63177) https://github.com/cisagov/Malcolm/pull/1043 Relevant CWE: CWE-770 Allocation of Resources Without Limits or Throttling Metrics CVSS Version Base Score Base Severity Vector String

3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What Happened

CISA Malcolm, reported by CISA.

3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

For the full technical details, see the original report.

Why It Matters for Businesses

This development could affect organizations that rely on the impacted technologies or services. Unpatched systems, misconfigured infrastructure, or lack of monitoring can leave businesses exposed to exploitation, data breaches, and regulatory penalties.

How to Check Your Exposure

Run a free scan on NEL Professional's Cyber Risk Scanner to check whether your domain is affected. The scan covers SSL/TLS, security headers, DNS configuration, email authentication, and more across 16 modules.

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Mitigation Steps

Patch immediately, Apply vendor patches or updates as soon as they are available.
Review configurations, Check firewall rules, access controls, and security headers.
Monitor logs, Watch for indicators of compromise (IOCs) related to this threat.
Update security policies, Ensure incident response plans cover this type of threat.
Run a security scan, Use automated tools to verify your exposure.

Need Expert Help?

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