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1HISTORY of the 7-Zip source code 1HISTORY of the 7-Zip source code
2-------------------------------- 2--------------------------------
3 3
425.01 2025-08-03
5-------------------------
6- The code for handling symbolic links has been changed
7 to provide greater security when extracting files from archives.
8 Command line switch -snld20 can be used to bypass default security
9 checks when creating symbolic links.
10
11
1225.00 2025-07-05
13-------------------------
14- 7-Zip for Windows can now use more than 64 CPU threads for compression
15 to zip/7z/xz archives and for the 7-Zip benchmark.
16 If there are more than one processor group in Windows (on systems with more than
17 64 cpu threads), 7-Zip distributes running CPU threads across different processor groups.
18- bzip2 compression speed was increased by 15-40%.
19- deflate (zip/gz) compression speed was increased by 1-3%.
20- improved support for zip, cpio and fat archives.
21- fixed some bugs and vulnerabilities.
22- the bug was fixed : CVE-2025-53816 : 7-Zip could work incorrectly for some incorrect RAR archives.
23- the bug was fixed : CVE-2025-53817 : 7-Zip could crash for some incorrect COM (Compound File) archives.
24
25
2624.09 2024-11-29
27-------------------------
28- The default dictionary size values for LZMA/LZMA2 compression methods were increased:
29 dictionary size compression level
30 v24.08 v24.09 v24.09
31 32-bit 64-bit
32 8 MB 16 MB 16 MB -mx4
33 16 MB 32 MB 32 MB -mx5 : Normal
34 32 MB 64 MB 64 MB -mx6
35 32 MB 64 MB 128 MB -mx7 : Maximum
36 64 MB 64 MB 256 MB -mx8
37 64 MB 64 MB 256 MB -mx9 : Ultra
38 The default dictionary size values for 32-bit versions of LZMA/LZMA2 don't exceed 64 MB.
39- 7-Zip now can calculate the following hash checksums: SHA-512, SHA-384, SHA3-256 and MD5.
40- APM and HFS support was improved.
41- If an archive update operation uses a temporary archive folder and
42 the archive is moved to the destination folder, 7-Zip shows the progress of moving
43 the archive file, as this operation can take a long time if the archive is large.
44- The bug was fixed: 7-Zip File Manager didn't propagate Zone.Identifier stream
45 for extacted files from nested archives (if there is open archive inside another open archive).
46- Some bugs were fixed.
47
48
424.08 2024-08-11 4924.08 2024-08-11
5------------------------- 50-------------------------
6- The bug in 7-Zip 24.00-24.07 was fixed: 51- The bug in 7-Zip 24.00-24.07 was fixed: