{"id":"MAL-2026-5519","title":"Malicious code in requests-toolbelt-plus (PyPI)","summary":"Malicious code in requests-toolbelt-plus (PyPI)","severity":"none","vendor":"requests-toolbelt-plus","product":"requests-toolbelt-plus","ecosystem":"pip","affected":["requests-toolbelt-plus"],"published":"2026-06-10","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/MAL-2026-5519","references":[{"url":"https://bad-packages.kam193.eu/pypi/package/requests-toolbelt-plus"},{"url":"https://pypi.org/project/requests-toolbelt-plus/99.9.9/"},{"url":"https://pypi.org/project/requests-toolbelt-plus/100.0.0/"},{"url":"https://pypi.org/project/requests-toolbelt-plus/99.9.10/"}],"tags":["osv","pip"],"ingestedAt":"2026-07-08T18:25:54.768Z","slug":"MAL-2026-5519","body":"## Overview\n\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (38c64ca050de4910f56bc4a652890b0a378082859cb62153762c6ae08b4b8eae)\nThe package impersonates the popular `requests-toolbelt` library but ships an empty `requests_toolbelt_plus/__init__.py` and places its real logic in `setup.py`. On `pip install`, setup.py checks `/proc/version` for WSL markers and, when matched, opens a TCP socket to the hardcoded IP 185.184.192.205 on port 4444, sends a JSON beacon containing `os.getlogin()`, `os.uname().nodename`, and `os.getcwd()`, then spawns a background thread that reads JSON commands from the socket and executes them via `subprocess.run(cmd, shell=True, capture_output=True, text=True)`, returning stdout/stderr to the operator — full remote command execution against the installer's machine. setup.py also appends a Python one-liner to `~/.bashrc` that re-opens the same socket, `dup2`s stdio onto it, and execs `/bin/bash -i`, giving the attacker a persistent interactive reverse shell that fires on every new login shell and survives package uninstall. The WSL-only gating is a deliberate evasion to stay dormant on non-WSL maintainer machines and execute only on targeted Windows-Subsystem-for-Linux developer hosts.\n\n## Source: kam193 (bd626be82a68d95788077b8b3c87a960c87d971e55496791cedf85154d99087f)\nInstalling the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.\n\n\n---\n\nCategory: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.\n\n\nCampaign: GENERIC-standard-pypi-install-pentest\n\n\nReasons (based on the campaign):\n\n\n - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n\n\n## Affected packages\n\n- `requests-toolbelt-plus`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}