7-Zip 25.01

[Igor Pavlov]

7-Zip 25.01 was released.

Download

7-Zip for 64-bit Windows x64:
https://7-zip.org/a/7z2501-x64.exe

7-Zip for 32-bit Windows x86:
https://7-zip.org/a/7z2501.exe

7-Zip for 64-bit Windows ARM64:
https://7-zip.org/a/7z2501-arm64.exe

7-Zip Extra: standalone console version, 7z DLL, Plugin for Far Manager:
https://7-zip.org/a/7z2501-extra.7z

7-Zip (console version) for 64-bit Linux x86-64 (AMD64):
https://7-zip.org/a/7z2501-linux-x64.tar.xz

7-Zip (console version) for 32-bit Linux x86:
https://7-zip.org/a/7z2501-linux-x86.tar.xz

7-Zip (console version) for 64-bit Linux ARM64:
https://7-zip.org/a/7z2501-linux-arm64.tar.xz

7-Zip (console version) for 32-bit Linux ARM:
https://7-zip.org/a/7z2501-linux-arm.tar.xz

7-Zip (console version) for macOS (ARM64 and x86-64):
https://7-zip.org/a/7z2501-mac.tar.xz

What's new in 7-Zip 25.01:

---

• 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.

[Charlie Opeke]

can somebody tell me which versions of 7-zip still receive patches, support and bug fixes? or should I just assume the latest stable version is the only active version?

[Gabriel Magana-Gonzalez]

Seeing from the changelog, it's only the latest version that receives changes. This is not an official position, though.

[mrfearless]

Noticed on bluesnews.com website a link to the new 7-zip release on github: https://github.com/ip7z/7zip

is this legit? repo and user look new. is it an example of a supply chain attack?

Just thought I would mention it just in case. Source from bluesnews is some web page called broadband bulletin: https://broadbandbulletin.com/d/4195-7-zip-v2501-released

Best regards

mrfearless

[teoberi]

Is legit!

[mrfearless]

Ok grand, just wanted to double check. No harm in verifying this i guess, specially nowadays with lots of shady stuff.

Thanks for letting me know.

Cheers.

[lelik007]

@ipavlov Igor, please take a look what's going on here, there's an archive:
7zFM shows: 543 Files, 53 Folders - this is right.
7z l shows: 543 files, 268 folders - this isn't right, but we don't know why this happens.
I used 7z2501-x64.exe for testing.

[Igor Pavlov]

call

7z l archive.7z > a.txt

and look a.txt lines.

[lelik007]

@ipavlov Yes, the file @tansy gave is that archive. Thanks for the quick response.
I made a mirror just in case.
@tansy

It's not limited to current version as our behaves the same for long time, if not forever.

Well, I didn't dig this deep.

[Igor Pavlov]

call

7z l archive.7z > a.txt
7z l archive.7z -slt > slt.txt

look it and think.
if you don't see the reason of problem, upload that listing files to some another thread and describe the problem.

[Alexey Shelaev]

@ipavlov thanks for the release!
Having issue when building Alone2 on macOS with recent clang. The command I use make -f ../../cmpl_mac_arm64.mak
The error I get

clang++ -arch arm64     -O2 -c -Werror -Wall -Wextra -Weverything -Wfatal-errors -Wno-poison-system-directories -DNDEBUG -D_REENTRANT -D_FILE_OF
FSET_BITS=64 -D_LARGEFILE_SOURCE -fPIC     -std=c++11  -o b/m_arm64/ApfsHandler.o ../../Archive/ApfsHandler.cpp
../../Archive/ApfsHandler.cpp:3542:3: fatal error: 'switch' missing 'default' label [-Wswitch-default]
 3542 |   switch (propID)
      |   ^
1 error generated.

The cure I applied: added -Wno-switch-default to CFLAGS_LIST inside warn_clang_mac.mak

[Igor Pavlov]

We have such lines CPP\Common\Common0.h

#if defined(Z7_LLVM_CLANG_VERSION) && __clang_major__ >= 18 // 18.1.0RC
#pragma GCC diagnostic ignored "-Wswitch-default"
#endif

Can you suggest exact lines to update it?

we have such macros:

#if defined(__clang__)
# define Z7_CLANG_VERSION  (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
#endif
#if defined(__clang__) && defined(__apple_build_version__)
# define Z7_APPLE_CLANG_VERSION   Z7_CLANG_VERSION
#elif defined(__clang__)
# define Z7_LLVM_CLANG_VERSION    Z7_CLANG_VERSION

So we must know what exact versions for apple and llvm switch-default must be ignored.
please call

./7zz b

it will show version of clang compiler.

[Alexey Shelaev]

My apple clang is 17.0.0 installed with Xcode 16.4, so the compilation works for me with the following modification of Common0.h

#if defined(Z7_LLVM_CLANG_VERSION) && __clang_major__ >= 18 /*18.1.0RC*/ \
   || defined(Z7_APPLE_CLANG_VERSION) && __clang_major__ >= 17 /*Apple clang version 17.0.0 (clang-1700.0.13.5)*/
#pragma GCC diagnostic ignored "-Wswitch-default"
#endif

I didn't find a straightforward way to install an older apple clang, so I can't confirm by tests the exact version since which the warnning fires. Though online llvm documentation states it starts firing since clang 18, and unofficial wiki versions mapping indicates that apple clang 17 is based on llvm 19, therefore the suggested modification would probably work correctly

[Igor Pavlov]

thanks.
probably even some old xcode versions support

#pragma GCC diagnostic ignored "-Wswitch-default"

so condition __clang_major__ >= 17 can be relaxed.

[arhfk]

i really enjoy 7-Zip since version 4.23. it's always a good feeling to extract or pack files with 7-Zip.

the most reliable software i have met.

[arhfk]

somehow 7-zip won't get unfollowed by the news. i install every update i can reach through winget and especially unigetUI. but i still know plenty of devices who still rely on 7-zip version 19.00 or even later. some journalists write horrific texts and stuff like CVSS-Score 7.0.

[ShakIO]

I keep downloading every single release and hoping with every update that dark mode is finally added! Please make it happen someday (hopefully soon)!

[Sam Tansy]

hoping with every update that dark mode is finally added

I wouldn't count on it.

There are 'forks' that have it. Dark7zip, 7zipDarkmode, or ready to go NanaZip, so use them.

[isidroco]

Still waiting for decompress option: only overwrite older files...

[lelik007]

@ipavlov
Hello Igor! I've got a question about the Fast Bytes in LZMA/2 methods, about their measurements. I mean 64 for compression level 9 or the maximum 273... are they really bytes? Or it's 64 or 273 ... something else?

[Igor Pavlov]

fb parameter is about number of bytes.
7-Zip GUI uses "Word size" field for that parameter.
"Word size" in help file:
Specifies the length of words, which will be used to find identical sequences of bytes for compression.

[lelik007]

@ipavlov
Thank you for your answer Igor, the implementations of Fast Bytes are very different, so I wanted to know exactly.
And if understand them right this is any integer value 5-273 (for example 160 or 224), I mean not just a degree of 2 or 3 multiply 2 ^ N (for example 128, 192)?

[Anh-Dung Le]

...

[Anh-Dung Le]

I have a .tar file that I want to compress into .gz file. I don't know why but the option Number of CPU threads of 7-Zip 25.01 (x64) does not work on my Windows 11 Pro 25H2, i.e., the option Number of CPU threads is greyed-out (disabled) and therefore there is no drop-down list to choose.

Could you explain on this issue?

On the other hand, parallel compression into gzip makes a huge difference: https://github.com/klauspost/pgzip?tab=readme-ov-file#compression-1

[Igor Pavlov]

That feature has no high priority for development.
You can use xz format instead of gzip.