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MKVToolNix v102.0 released

2026-09-14 — mosu

Hello gentle people!

An unsually short time between releases means a security fix, and that’s almost all this release is.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

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.

Have fun! 😁

MKVToolNix v101 released

2026-08-24 — mosu

Hey y’all!

The first release after the milestone round version v100 is here, v101. It’s pretty small, but I still suggest everyone update due to the inclusion of updated underlying libraries libEBML & libMatroska. Both are updated to their respective releases from a couple of weeks ago which fix several potential invalid memory access cases that could be triggered by reading files broken in very rare, specific ways. Basically they’re potentially security-relevant.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

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 replaed 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.

Have fun! 💝😁

MKVToolNix v100 released

2026-07-05 — mosu

Heyo!

It’s happening, v100 is here. Yay! It contains nothing overly drastic, but it’s still a nice assortment of enhancements & bug fixes for users of all OS.

A big thanks to all the contributors over the years, but especially for the people who have contributed over the last three months. This yielded continued macOS builds and several bug fixes that I hadn’t gotten around to tackling myself.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 100.0 “Do Hot Girls Like Chords” 2026-07-05

New features and enhancements

  • all: added new scalable (SVG) application icons for all applications, replacing the existing pixmap (PNG, ICO) icons. Icons from Sarreq Teryx. Implements #6253.
  • mkvmerge: MP4 reader: track names are now read from the track’s user-data atoms (trak → udta → name) if present. Implements #6274.
  • MKVToolNix GUI: executing actions configuration, type “play audio file”: added a slider to make configuration more intuitive. Implemented by #6267.
  • MKVToolNix GUI: executing actions: macOS only: the GUI will now use bundled audio files for “play audio file” actions that Qt can play instead of using macOS’s system sounds. Implemented by #6268. Fixes #6264.
  • MKVToolNix GUI: executing actions: Windows only: added a new type: executing a PowerShell script. Either an existing script file can be selected or custom PowerShell script code entered in a small editor. The executed script has access to all MTX_… variables through the environment, e.g. $env:MTX_DESTINATION_FILE_BASE_NAME. Workaround for the problems talked about in #6254.
  • MKVToolNix GUI: job queue: added a context menu for opening copies of the selected queue jobs in the multiplexer as new settings there without removing the queue jobs. Implements #6255.
  • MKVToolNix GUI: job queue: added a search functionality for jobs that searches in job descriptions, outputs, warnings & errors. Implements #6256.

Bug fixes

  • command-line tools: Windows: switched to Boost’s UTF-8 code-conversion facet (boost::locale::utf8_codecvt) from std::utf8_codecvt included in MingW. This seems to fix an issue with converting certain high code point from wchar_t to char (from UTF-32/16 to UTF-8), preventing interesting exceptions from being thrown. Fixes #6257.
  • mkvmerge: AAC: fixed mis-detection of ADTS streams not starting on a frame boundary. Fixes regression starting with v87 when fixing AAC LATM config not being parsed if it wasn’t present in the first AAC frame. Patch by Corticalcode. Fixes #6196.
  • mkvmerge: MPEG TS reader: under certain rare conditions mkvmerge was skipping a certain amount of content at the start of the main M2TS file when reading MPLS playlists. The amount of content skipped proportional to the probe range percentage. This only happened when the source Blu-ray contains HDMV TextST subtitles. Fixes #6269.
  • MKVToolNix GUI: executing actions configuration, type “play audio file”: fixed audio volume not working since switching to Qt 6 due to its interface taking a float in range 0.0–1.0 instead of the old interface taking an int in range 0–100. Implemented by #6267. Fixes #6266.
  • MKVToolNix GUI: executing actions: fix backslash handling when parsing a Unix-shell escaped string into separate arguments. The user-visible fix is that the command-line in the “executing actions” dialog will not have the quoting changed in wrong ways by the GUI when the GUI adds another variable upon user request, a regression introduced in v99. Fixes #6253.

Build system changes

  • all: when building for Windows the programs ImageMagick (executable magick) & Inkscape (executable inkscape) are required in order to build ICOs from SVGs.
  • macOS: include the app’s supported platform(s) in Info.plist to correctly resolve the app’s Kind as Apple Silicon in System Information. Detected during discussion of #6260.
  • macOS: updated Qt to 6.11.1. The patch that made building Qt from source possible on macOS 26.4 (by Touchstone64) has been removed as Qt 6.11.1 includes the fix upstream. See #6276.

Have fun yall! 💖🎉

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