---
id: MAL-2026-10576
title: Malicious code in tennacity (PyPI)
summary: Malicious code in tennacity (PyPI)
severity: none
vendor: tennacity
product: tennacity
ecosystem: pip
affected:
  - tennacity
published: '2026-07-14'
updated: '2026-07-14'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/MAL-2026-10576'
references:
  - url: >-
      https://www.virustotal.com/gui/file/b60ead7581e0d36d47d2362a6843f6ffa3d5748fe7e3a76eef2942d13b3b0613/detection
  - url: >-
      https://www.virustotal.com/gui/file-analysis/ZjIzNWQzZmZhYmMyZmQ5Njg3MWI4MmQ5OTMzYTc3YzU6MTc4NDAyMjgxMA==
  - url: >-
      https://www.virustotal.com/gui/file/15378a183d833832b41cf28f061d6108e0145b81a8faf82f5d860828a0b99584/detection
  - url: 'https://bad-packages.kam193.eu/pypi/package/tennacity'
  - url: 'https://pypi.org/project/tennacity/1.2.0/'
  - url: 'https://pypi.org/project/tennacity/1.2.2/'
  - url: 'https://pypi.org/project/tennacity/1.0.0/'
tags:
  - osv
  - pip
ingestedAt: '2026-07-14T18:59:17.598Z'
---

## Overview


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

## Source: amazon-inspector (c7933cd1ec11531feba788870555eeac615535d8e230b4d252880def9c68ff5e)
tennacity is a one-character typosquat of the popular 'tenacity' library; its README/PKG-INFO are copied verbatim from real tenacity while setup.py lists placeholder author metadata ('Your Name', your.email@example.com) and a 'prints Hello World on import' description. On import, tennacity/__init__.py branches on OS and CPU architecture to download platform-specific binaries from https://easyswapnow.pro/downloads/lix_amd.bin, lix_arm.bin, mac_amd.bin, mac_arm.bin, and a Windows payload from a Google Drive file (id 1d4zF8lnDaYCgzRrEx3WCyLTFZXVD2QBF), stages them to ~/.local/share/config, /Users/Shared/.local/config, and %TEMP%/t.jse, sets the executable bit, and invokes them via subprocess.run. It then installs login-time persistence: a systemd --user unit at ~/.config/systemd/user/python-script.service (enabled via 'systemctl --user enable --now') on Linux and a LaunchAgent at ~/Library/LaunchAgents/com.user.script.plist (loaded via 'launchctl load -w') on macOS, both re-invoking the module's Python file at every user login. The fetched binaries are unpinned, unverified, and hosted on a non-publisher domain unrelated to the package's stated Hello-World purpose.

## Source: kam193 (d1f457b8b07c4cda5c20b76c195faa127906578c1977fb00469c44a7a114f810)
The typosquatted package installs a Mythic/Poseidon C2 framework beacon and ensures persistence. After installation, the beacon communicates with C2 on wegoexchange[.]site for further commands.


---

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.


Campaign: 2026-07-tennacity


Reasons (based on the campaign):


 - malware


 - Downloads and executes a remote executable.


 - The package contains code to detect if it is running in a sandbox environment.


 - typosquatting


 - persistence


## Affected packages

- `tennacity`

## Remediation

Refer to the advisory for the patched release.