---
id: CVE-2026-63134
title: Malcolm is a network traffic analysis tool suite
summary: >-
  Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0,
  `safe-extract.py` protects file extraction with libarchive's secure flags, but
  creates directory entries with a raw `os.makedirs(os.path.join(dest,
  entry.pathnam…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-22
vendor: cisagov
product: Malcolm
affected:
  - Malcolm < 26.07.0
published: '2026-08-11'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T21:16:55.983'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63134'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/releases/tag/v26.07.0'
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-65mm-vgrw-vqx4'
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01'
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-65mm-vgrw-vqx4'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-13T14:59:57.659002Z'
epss: 0.00421
epssPercentile: 0.36276
ingestedAt: '2026-09-09T21:22:45.530Z'
---

## Overview

Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, `safe-extract.py` protects file extraction with libarchive's secure flags, but creates directory entries with a raw `os.makedirs(os.path.join(dest, entry.pathname))` that has no traversal protection. An uploaded malicious archive containing a directory entry with a `../` sequence or an absolute path causes the filebeat processing container to create directories outside the intended extraction directory. Version 26.07.0 fixes the issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.