CVE-2026-63134: Cisagov Malcolm

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Cisagov Malcolm: before 26.07.0 (fixed in 26.07.0)

Published 2026-08-11. Last modified 2026-10-02.