pwntools

What it is and what it does

Pwntools is a Python library designed to streamline exploit development and CTF challenge solving. It provides a high-level interface for common tasks like assembling shellcode, disassembling binaries, connecting to remote services, and finding ROP gadgets. The library abstracts away low-level details so developers can focus on exploit logic rather than boilerplate.

The package bundles 22 runtime dependencies covering SSH (paramiko), serialization (pyelftools, capstone), networking (requests, pysocks), and binary analysis (ropgadget, unicorn emulation). It supports both Python 2.7 and Python 3, though Python 3 is recommended. Most functionality is pure Python; optional features for cross-architecture assembly/disassembly require system libraries.

Use it for:

• Writing exploits for CTF capture-the-flag competitions by automating shellcode generation and payload delivery
• Analyzing and disassembling binaries across multiple architectures using capstone and pyelftools
• Finding and chaining ROP gadgets for return-oriented programming attacks
• Prototyping binary exploits with rapid iteration and interactive debugging
• Emulating and testing shellcode behavior using unicorn CPU emulation

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

Pwntools is a CTF framework and exploit development library providing tools for writing exploits, assembling/disassembling code, interacting with remote services, and analyzing binaries.

Yes. Pwntools is actively maintained, widely used (top 5000 PyPI), has no known vulnerabilities, and low install friction. It's the standard toolkit for CTF participants and binary exploitation researchers. Install it if you work on exploit development, security research, or CTF challenges; skip it if you don't need those capabilities.

Install

pwntools on PyPI

pip install pwntools

uv add pwntools

poetry add pwntools

Installing pwntools

Before you install

Low install friction with a pure-Python wheel distribution. Actively maintained with recent commits and a large community (13645 stars). Most functionality is self-contained; optional features for foreign architecture assembly/disassembly require system dependencies.

License in practice

Mostly MIT with some GPL/BSD components (see LICENSE-pwntools.txt). Permissive license allows broad use, but GPL portions may impose copyleft obligations if distributed.

Quickstart

pip install pwntools
from pwntools import *
context(arch='i386', os='linux')
r = remote('example.com', 31337)
r.send(asm(shellcraft.sh()))
r.interactive()

Some features (assembling/disassembling foreign architectures) require non-Python system dependencies; best supported on 64-bit Ubuntu LTS.

Verify before relying

• Whether all 22 runtime dependencies are required for basic CTF tasks or only for advanced features
• Current status of Python 2.7 support given the 2025-10-12 release date
• Exact import path and API surface for the main module

Package facts

Evidence: pwntools-4.15.0-py2.py3-none-any.whl

Keywords: pwntools, exploit, ctf, capture, the, flag, binary, wargame, overflow, stack, heap, defcon

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