CVE-2026-63134

MEDIUM 5.4

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

CVSS Score

5.4

EPSS Score

0.4%

EPSS Percentile

29th

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.

CWE	CWE-22
Vendor	cisagov
Product	malcolm
Published	Aug 11, 2026
Last Updated	Oct 2, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Affected Versions

cisagov / Malcolm

< 26.07.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cisagov/Malcolm/security/advisories/GHSA-65mm-vgrw-vqx4 github.com: https://github.com/cisagov/Malcolm/releases/tag/v26.07.0 cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json

Credits

pavanchow reported this vulnerability to CISA.