---
id: "MAL-2026-17927"
kind: "package"
aliases: ["MAL-2026-17927"]
title: "Malicious code in fabtoolkit (PyPI)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "fabtoolkit", "fixed": [], "affected": "= 0.1.2; = 0.1.1; = 0.1.0; = 0.2.1", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-19T02:26:31+00:00"
first_seen_at: "2026-10-26T20:52:00+00:00"
updated_at: "2026-10-26T21:04:10+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-17927", "first_seen_at": "2026-10-26T20:52:00+00:00"}]
---

# Malicious code in fabtoolkit (PyPI)

## Affected

- pypi:fabtoolkit affected = 0.1.2; = 0.1.1; = 0.1.0; = 0.2.1 fixed ?

## Timeline

- 2026-10-26T20:52:00+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-17927

## From the sources

---
_-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (e55333b9d934a04c029943e0e6fbf34fff7c1344e0d1964b6860bc02d322855d)
fabtoolkit executes a payload (embedded as a CHILD string run via `subprocess.run([sys.executable,'-I','-c',CHILD],...)`) that fetches a JSON config from https://transfer.archivete.am/H2Uxm/fabdeploycheck-config.json with TLS verification disabled (`ssl._create_unverified_context()`) and dispatches on config-supplied `kind` values: `file` reads arbitrary filesystem paths, `run` executes attacker-supplied argv via subprocess, `http` issues attacker-chosen requests with Bearer tokens chained from previously-read files, `tcp` probes ports, and `revsh` forks a daemon that polls `base+'/'+ident+'-cmd.txt'` and pipes the returned bytes into `/bin/sh -c`, PUTting stdout/stderr back to the same host. Collected file contents, command output, HTTP responses, and probe results are packed into an in-memory zip and PUT to transfer.archivete.am under an attacker-chosen report name. Before daemonizing, the payload walks `/proc/*/cmdline` and SIGKILLs processes whose cmdlines contain `FABDRV3`, `fabdrv2`, or `connection ready`, enforcing single-instance persistence and clearing prior variants. The entry points `python -m fabtoolkit` and any import path reaching `selftest()`/`check()` trigger the payload. The destination is an anonymous public file-transfer host; config-controlled file reads enable harvesting of credentials such as `~/.aws/credentials` and `~/.ssh/*` along with cloud metadata via the `http` kind. The package has no legitimate functionality matching its naming.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_