MKVToolnix

MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some.

With these tools one can get information about (mkvinfo) Matroska files, extract tracks/data from (mkvextract) Matroska files and create (mkvmerge) Matroska files from other media files. Matroska is a new multimedia file format aiming to become THE new container format for the future.

• Release Date: Sep 15, 2026
• Download(s):
  mkvtoolnix-32-bit-102.0-setup.exe
  mkvtoolnix-32-bit-102.0.7z
  mkvtoolnix-64-bit-102.0-setup.exe
  mkvtoolnix-64-bit-102.0.7z
  MKVToolNix_GUI-102.0-x86_64.AppImage
• # Version 102.0 "Little Houses" 2026-09-14
  
  
  ## Bug fixes
  
  
  * MKVToolNix GUI: executing actions, type "execute a program": all the
    variables (`<MTX_…>`) will now be replaced again in the argument list to the
    program to be executed. This was broken in v100. Fixes #6306.
  
  
  ## Security fixes
  
  
  * CVE-2026-90783: avilib: fixed potential heap overflows/invalid memory access
    in the ODML index handling due to unsiged integer multiplication wrapping
    around (colloquially known as "overflowing") with specifically crafted AVI
    files. Affects only mkvmerge as the other tools do not read AVIs. Reported
    by Tristan Madani <TristanInSec@gmail.com>.
  
  
  
  
  # Version 101.0 "Time To Turn" 2026-08-24
  
  
  ## New features and enhancements
  
  
  * translations: substantial extension of the Czech translation by Michal
    Várady.
  
  
  ## Bug fixes
  
  
  * mkvmerge: TrueHD parser: fixed mkvmerge dropping the last TrueHD frame if
    its size was smaller than 12 bytes. Fixes #6296.
  * MKVToolNix GUI: job runner: the variable `<MTX_INSTALLATION_DIRECTORY>` will
    be replaced in the executable position of the command-line for the program
    to execute again. Fixes #6299.
  * Windows: fixed converting the scalable SVG icons into the bitmap `.ico` ones
    used on Windows so that the grey background remains uniform & doesn't get
    garbled. Fixes #6280.
  
  
  ## Build system changes
  
  
  * The bundled libraries libEBML & libMatroska were updated to v1.4.7 &
    v1.7.2 respectively. Those versions fix various possible invalid memory
    accesses when reading data broken in certain, very specific ways, making
    them security sensitive.
  * libEBML v1.4.7 & libMatroska v1.7.2 are now required.
  * The meta info file `org.bunkus.mkvtoolnix-gui.appdata.xml` was renamed
    to `org.bunkus.mkvtoolnix-gui.metainfo.xml`.