CVE-2026-63134

Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation

Published Aug 11, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
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

Vendor Solution

Malcolm version 26.07.0 addresses these issues. For more information, see  https://github.com/cisagov/Malcolm/pull/1043

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Cisagov
Cisagov malcolm
Vendors & Products Cisagov
Cisagov malcolm
Type Values Removed Values Added
Description 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.
Title Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 2, 2026, 8:23 PM
Reserved
Jul 15, 2026, 4:54 PM
Status
Awaiting Analysis
Published
Aug 11, 2026, 9:17 PM
Modified
Oct 24, 2026, 4:10 PM