cisagov Malcolm up to 26.6.x File Extraction safe-extract.py os.makedirs entry.pathname path traversal

Summaryinfo

A vulnerability described as critical has been identified in cisagov Malcolm up to 26.6.x. This affects the function os.makedirs of the file safe-extract.py of the component File Extraction. The manipulation of the argument entry.pathname results in path traversal. This vulnerability was named CVE-2026-63134. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in cisagov Malcolm up to 26.6.x. Affected is the function os.makedirs of the file safe-extract.py of the component File Extraction. The manipulation of the argument entry.pathname with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-63134 since 07/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 26.07.0 eliminates this vulnerability.

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Productinfo

Vendor

• cisagov

Name

• Malcolm

Version

• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5
• 26.6

Website

• Product: https://github.com/cisagov/Malcolm/

CPE 2.3info

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CPE 2.2info

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