---
id: capstone
version: "5.0.9"
license: unclear
license_treatment: permissive
maintenance: active
---

# capstone — Capstone disassembly engine

License: permissive · Maintenance: active · Downloads: 3.6M/mo

## What it is and what it does

Capstone is a lightweight, architecture-neutral disassembly framework designed for binary analysis and reverse engineering. It decodes machine code into assembly instructions for multiple CPU architectures (ARM, ARM64, MIPS, PPC, Sparc, SystemZ, XCore, X86) and provides semantic details about each instruction, such as implicit register reads and writes. The core is implemented in C with Python bindings, making it suitable for malware analysis and security research.

The package is distributed as precompiled wheels for most platforms, so installation via pip is typically frictionless. If you need to build from source, a C compiler is required. You can optionally point to an existing system-installed libcapstone library via the LIBCAPSTONE_PATH environment variable to skip the build step. The single runtime dependency is importlib-resources.

Use it for:

- Disassemble and analyze malware binaries to understand their behavior and identify obfuscation techniques.
- Reverse-engineer compiled executables to audit security properties or recover lost source code.
- Build custom binary analysis tools that need to decode machine code across multiple CPU architectures.
- Analyze firmware or embedded system binaries where architecture support and lightweight overhead are critical.
- Implement security research workflows that require extracting and analyzing instruction semantics from compiled code.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Capstone is a disassembly engine that decodes binary machine code into human-readable assembly instructions across multiple CPU architectures including ARM, ARM64, MIPS, PPC, Sparc, SystemZ, XCore, and X86.

Yes. Capstone is a mature, widely-used disassembly engine with no known vulnerabilities, permissive licensing, and straightforward installation via precompiled wheels. It is the right choice if you need to decode and analyze binary code across multiple architectures.

## Install

pip install capstone
uv add capstone
poetry add capstone

## Installing capstone

Before you install: Precompiled wheels are available for most common platforms (macOS, Linux, Windows across multiple architectures), making installation straightforward via pip. A C compilation environment is only needed if building from source; the package has one lightweight runtime dependency.

License in practice: Released under the BSD license, which is permissive and allows commercial use, modification, and redistribution with minimal restrictions—you must include the LICENSE.TXT file with redistributed binaries or source.

Quickstart:

pip install capstone

import capstone

md = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_64)
for instr in md.disasm(b'\x00'):
    print(instr.mnemonic)

Requires Python 3.8 or later; if building from source on Windows, Visual Studio and the Developer Command Prompt are needed to compile C code.

Verify before relying:

- Whether the package provides semantics (implicit register reads/writes) through a straightforward API or requires additional configuration.
- Performance characteristics when disassembling large binaries or handling complex malware patterns.
- Thread-safety guarantees and any caveats for concurrent disassembly operations.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: active
- Downloads: 3.6M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

disassembly engine, binary code analysis, machine code decoder, assembly instruction parsing, reverse engineering tool, architecture-neutral disassembler, malware analysis, binary-analysis, reverse-engineering, disassembly

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