HISTORY of the 7-Zip
--------------------

This file contains information about changes for latest versions of 7-Zip.
The full changelog file can be downloaded here:
https://7-zip.org/history.txt

25.01          2025-08-03
-------------------------
- The code for handling symbolic links has been changed 
  to provide greater security when extracting files from archives.
  Command line switch -snld20 can be used to bypass default security 
  checks when creating symbolic links.


25.00          2025-07-05
-------------------------
- 7-Zip for Windows can now use more than 64 CPU threads for compression
  to zip/7z/xz archives and for the 7-Zip benchmark.
  If there are more than one processor group in Windows (on systems with more than
  64 cpu threads), 7-Zip distributes running CPU threads across different processor groups.
- bzip2 compression speed was increased by 15-40%.
- deflate (zip/gz) compression speed was increased by 1-3%.
- improved support for zip, cpio and fat archives.
- fixed some bugs and vulnerabilities.
- the bug was fixed : CVE-2025-53816 : 7-Zip could work incorrectly for some incorrect RAR archives. 
- the bug was fixed : CVE-2025-53817 : 7-Zip could crash for some incorrect COM (Compound File) archives. 


24.09          2024-11-29
-------------------------
- The default dictionary size values for LZMA/LZMA2 compression methods were increased:
         dictionary size   compression level
  v24.08  v24.09  v24.09
          32-bit  64-bit
    8 MB   16 MB   16 MB   -mx4
   16 MB   32 MB   32 MB   -mx5 : Normal
   32 MB   64 MB   64 MB   -mx6
   32 MB   64 MB  128 MB   -mx7 : Maximum
   64 MB   64 MB  256 MB   -mx8
   64 MB   64 MB  256 MB   -mx9 : Ultra
  The default dictionary size values for 32-bit versions of LZMA/LZMA2 don't exceed 64 MB.
- 7-Zip now can calculate the following hash checksums: SHA-512, SHA-384, SHA3-256 and MD5.
- APM and HFS support was improved.
- If an archive update operation uses a temporary archive folder and
  the archive is moved to the destination folder, 7-Zip shows the progress of moving
  the archive file, as this operation can take a long time if the archive is large.
- The bug was fixed: 7-Zip File Manager didn't propagate Zone.Identifier stream
  for extracted files from nested archives (if there is open archive inside another open archive).
- Some bugs were fixed.


24.08          2024-08-11
-------------------------
- The bug in 7-Zip 24.00-24.07 was fixed:
  For creating a zip archive: 7-Zip could write extra zero bytes after the end of the archive,
  if a file included to archive cannot be compressed to a size smaller than original.
  The created zip archive is correct except for the useless zero bytes after the end of the archive.
  When unpacking such a zip archive, 7-Zip displays a warning:
    "WARNING: There are data after the end of archive".
- The bug was fixed: there was a leak of GDI objects (internal resources in Windows)
  in "Confirm File Replace" window, causing problems after 1600 displays of "Confirm File Replace"
  window from same running 7-Zip process.
- Some optimizations for displaying file icons in 7-Zip File Manager and in "Confirm File Replace" window.
- Some bugs were fixed.


24.07          2024-06-19
-------------------------
- The bug was fixed: 7-Zip could crash for some incorrect ZSTD archives.


24.06          2024-05-26
-------------------------
- The bug was fixed: 7-Zip could not unpack some ZSTD archives.


24.05          2024-05-14
-------------------------
- New switch -myv={MMNN} to set decoder compatibility version for 7z archive creating.
  {MMNN} is 4-digit number that represents the version of 7-Zip without a dot.
  If -myv={MMNN} switch is specified, 7-Zip will only use compression methods that can
  be decoded by the specified version {MMNN} of 7-Zip and newer versions.
  If -myv={MMNN} switch is not specified, -myv=2300 is used, and 7-Zip will only
  use compression methods that can be decoded by 7-Zip 23.00 and newer versions.
- New switch -myfa={FilterID} to    allow 7-Zip to use the specified filter method for 7z archive creating.
- New switch -myfd={FilterID} to disallow 7-Zip to use the specified filter method for 7z archive creating.
- Some bugs were fixed.


24.04          2024-04-05
-------------------------
- New menu item in 7-Zip File Manager: "Tools / Delete Temporary Files...".
  This menu item opens a window showing temporary folders and files
  created by 7-Zip in the user's "Temp" folder on a Windows system.
  In this window, the user can delete temporary files.


24.03          2024-03-23
-------------------------
- 7-Zip now can use new RISCV filter for compression to 7z and xz archives.
  RISCV filter can increase compression ratio for data containing executable
  files compiled for RISC-V architecture.
- The speed for LZMA and LZMA2 decompression in ARM64 version for Windows
  was increased by 20%-60%.
- 7-Zip GUI and 7-Zip File Manager can ask user permission to unpack RAR archives that
  require big amount of memory, if the dictionary size in RAR archive is larger than 4 GB.
- new switch -smemx{size}g : to set allowed memory usage limit for RAR archive unpacking.
  RAR archives can use dictionary up 64 GB. Default allowed limit for RAR unpacking is 4 GB.
- 7zg.exe (7-Zip GUI): -y switch disables user requests and messages.
- 7-Zip shows hash methods XXH64 and BLAKE2sp in context menu.
- -slmu switch : to show timestamps as UTC instead of LOCAL TIME.
- -slsl switch : in console 7-Zip for Windows : to show file paths with
  linux path separator slash '/' instead of backslash separator '\'.
- 7-Zip supports .sha256 files that use backslash path separator '\'.
- Some bugs were fixed.


24.01          2024-01-31
-------------------------
- 7-Zip now can unpack ZSTD archives (.zst filename extension).
- 7-Zip now can unpack ZIP, SquashFS and RPM archives that use ZSTD compression method.
- 7-Zip now supports fast hash algorithm XXH64 that is used in ZSTD.
- 7-Zip now can unpack RAR archives (that use larger than 4 GB dictionary) created by new WinRAR 7.00.
- 7-Zip now can unpack DMG archives that use XZ (ULMO/LZMA) compression method.
- 7-Zip now can unpack NTFS images with cluster size larger than 64 KB.
- 7-Zip now can unpack MBR and GPT images with 4 KB sectors.
- Speed optimizations for archive unpacking: rar, cab, wim, zip, gz.
- Speed optimizations for hash caclulation: CRC-32, CRC-64, BLAKE2sp.
- The bug was fixed: 7-Zip for Linux could fail for multivolume creation in some cases.
- Some bugs were fixed.


23.01          2023-06-20
-------------------------
- The page "Language" in 7-Zip's menu Tools/Options now shows information
  about selected translation, including the number of translated lines.
- Some bugs were fixed.


23.00          2023-05-07
-------------------------
- 7-Zip now can use new ARM64 filter for compression to 7z and xz archives.
  ARM64 filter can increase compression ratio for data containing executable
  files compiled for ARM64 (AArch64) architecture.
  Also 7-Zip now parses executable files (that have exe and dll filename extensions)
  before compressing, and it selects appropriate filter for each parsed file:
    - BCJ or BCJ2 filter for x86 executable files,
    - ARM64 filter for ARM64 executable files.
  Previous versions by default used x86 filter BCJ or BCJ2 for all exe/dll files.
- Default section size for BCJ2 filter was changed from 64 MiB to 240 MiB.
  It can increase compression ratio for executable files larger than 64 MiB.
- UDF: support was improved.
- cpio: support for hard links.
- Some changes and optimizations in WIM creation code.
- When new 7-Zip creates multivolume archive, 7-Zip keeps in open state
  only volumes that still can be changed. Previous versions kept all volumes
  in open state until the end of the archive creation.
- 7-Zip for Linux and macOS now can reduce the number of simultaneously open files,
  when 7-Zip opens, extracts or creates multivolume archive. It allows to avoid
  the failures for cases with big number of volumes, bacause there is a limitation
  for number of open files allowed for a single program in Linux and macOS.
- There are optimizations in code for 7-Zip's context menu in Explorer:
  the speed of preparing of the menu showing was improved for cases when big number of
  files were selected by external program for context menu that contains 7-Zip menu commands.
- There are changes in code for the drag-and-drop operations to and from 7-Zip File Manager.
  And the drag-and-drop operation with right button of mouse now is supported for some cases.
- The bugs were fixed:
  - ZIP archives: if multithreaded zip compression was performed with more than one
      file to stdout stream (-so switch), 7-Zip didn't write "data descriptor" for some files.
  - ext4 archives: 7-Zip couldn't correctly extract symbolic link to directory from ext4 archives.
  - HFS and APFS archives: 7-Zip incorrectly decoded uncompressed blocks (64 KiB) in compressed forks.
  - HFS : zlib without Adler supported
  - Some another bugs were fixed.


==
End of document
