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Tool

Zydis

Lightweight C11 x86/x86-64 disassembler and code-generation library. Its decoder reports each instruction's operands, accessed CPU and FPU flags, ISA set and extension and branch type; the formatter prints Intel, MASM or AT&T syntax, and the encoder assembles instructions from encoder requests, which can also be derived from decoded instructions. ZydisDisasm and ZydisInfo command-line tools are included, and the official Rust and Python 3 bindings live in separate repositories.

Targets
Binary
Category
Binary analysis libraries
Relationship
Foundation tool
Sources reviewed

Requirements & limits

  • Latest release at review: v4.1.1, published 2025-02-16 with no attached files; v4.1.0 (2024-02-04) carries the zydis-amalgamated single-header and single-source archives the README describes. The README says master holds the next, unreleased version without API stability guarantees; the reviewed master commit (2026-07-27) declares 5.0.0 and is 121 commits ahead of and 59 behind the v4.1.1 tag.
  • Build with CMake 3.10+ (the README lists Windows, macOS, Linux and the BSDs), the Meson 1.3+ build file, the maintained Visual Studio 2022 project, or the amalgamated files with any C11 compiler. A recursive clone fetches the Zycore support library from its zycore-c submodule unless a system copy is forced. The README lists Arch, Debian, Ubuntu, Homebrew, NixOS and vcpkg packages, and CMake options can disable the decoder, encoder, formatter, AVX-512 or KNC support or force minimal decoding mode.
  • The caller supplies code bytes and selects a 16-, 32- or 64-bit machine mode; ZydisDisasm reads a raw byte file. No executable-format loader is documented, so locating code in PE, ELF or firmware images needs another tool.
  • MIT license; Zycore is a separate MIT-licensed zyantific repository. The README's statements about performance, dependency-free and allocation-free operation, thread safety, testing on Windows, macOS, FreeBSD, Linux and UEFI, and use in x64dbg, Firefox and WebKit.

About this entry

The description was reviewed against primary sources.

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Primary sources

  1. README.md GitHub · zyantific/zydis · Revision a95bb71
  2. README.md#L73-L135 GitHub · zyantific/zydis · Revision a95bb71
  3. README.md#L159-L175 GitHub · zyantific/zydis · Revision a95bb71
  4. CMakeLists.txt#L1-L80 GitHub · zyantific/zydis · Revision a95bb71
  5. meson.build GitHub · zyantific/zydis · Revision a95bb71
  6. include/Zydis/DecoderTypes.h GitHub · zyantific/zydis · Revision a95bb71
  7. include/Zydis/Encoder.h GitHub · zyantific/zydis · Revision a95bb71
  8. include/Zydis/Formatter.h GitHub · zyantific/zydis · Revision a95bb71
  9. tools/ZydisDisasm.c GitHub · zyantific/zydis · Revision a95bb71
  10. .gitmodules GitHub · zyantific/zydis · Revision a95bb71
  11. LICENSE GitHub · zyantific/zydis · Revision a95bb71
  12. https://github.com/zyantific/zydis/releases/tag/v4.1.1
  13. https://github.com/zyantific/zydis/releases/tag/v4.1.0
  14. https://github.com/zyantific/zydis/compare/v4.1.1...a95bb71013436547f689fc0b380f48edf663066e

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