Vulnerability · Published Aug 11, 2026 · Assigned by GitHub_M
CVE-2026-63134Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation
Medium 5.4
In plain English
A medium-severity path traversal in Malcolm from cisagov. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
References
- https://github.com/cisagov/Malcolm/security/advisories/GHSA-65mm-vgrw-vqx4 x_refsource_CONFIRM
- https://github.com/cisagov/Malcolm/releases/tag/v26.07.0 x_refsource_MISC
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json