7-Zip 18.05 update: performance improvements and security patch

Martin Brinkmann
May 1, 2018

7-Zip 18.05 is a new version of the popular open source archiving software for Microsoft's Windows operating system. The new version improves the performance of some decoding and compression operations, and includes a security patch in the RAR module.

There are no new features, however, in the new release.

Existing and new users can download the 32-bit or 64-bit version of 7-Zip 18.05 from the official project website over at Sourceforge.

The new version can be installed over the previous version to upgrade it. You can check the installed version with a click on Help > About 7-Zip in the program interface.

7-Zip 18.05

7-zip 18.05

The new version of the archiving software improves the performance of some operations. Specifically, decoding performance and compression performance for LZMA and LZMA2 improved significantly.

The change notes list the following improvements:

  • The speed for single-thread LZMA/LZMA2 decoding was increased by 30% in x64 version and by 3% in x86 version.
  • 7-Zip now can use multi-threading for 7z/LZMA2 decoding, if there are multiple independent data chunks in LZMA2 stream.
  • 7-Zip now can use multi-threading for xz decoding, if there are multiple blocks in xz stream.
  • The speed for LZMA/LZMA2 compressing was increased by 8% for fastest/fast compression levels and by 3% for normal/maximum compression levels.

7-Zip 18.05 changes the large memory pages use on systems running Windows 10. The archive software won't use large pages on Windows 10 version 1709 (the Fall Creators Update) or earlier because of "some BUG with 'Large Pages' in Windows 10".

The change log highlights improvements in the zip, hfs and dmg code on top of that.

The new 7-Zip version fixes a security vulnerability in the Rar unpacking code. 7-Zip users who use the software to unpack RAR archives occasionally or regularly may want to upgrade to the latest version as soon as possible to protect the system against potential exploits targeting the vulnerability.

Closing Words

7-Zip updates seem to be released at a much faster pace recently which is a good thing. 7-Zip 18.05 is the second release this year after 7-Zip 18.01 was released in January 2018.

Now You: Which archiving software do you use, and why?

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7-Zip 18.05 update: performance improvements and security patch
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7-Zip 18.05 update: performance improvements and security patch
7-Zip 18.05 is a new version of the popular open source archiving software for Microsoft's Windows operating system. The new version improves the performance of some decoding and compression operations, and includes a security patch in the RAR module.
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  1. clairvaux said on August 4, 2018 at 6:53 pm

    I use Bandizip, and keep Pea Zip installed because it looks powerful. However the latter scatters items in my context menus, with no obvious way to tidy them up, which is a shooting offence in my book (this is probably hate speech against Pea Zip employees / sole proprietor / donors, who are only trying to make the world a better place).

    I, of course, have 7 Zip installed since eons, and never use it. First, because the developer has obviously made a bet with school mates not to ever get rid of his set of icons staring right at you from the prehistoric times of computer graphic design, and then for the simple reason that I’ve never been able to work out how to do the most basic things with it.

    I hate-hate-hate software that are not obvious to use, and create their own little bubble of thought. Zipping programs tend to be in that ballpark. Sticking to old, big, ugly icons does not do the trick.

  2. Mike said on June 18, 2018 at 6:06 pm

    Is it actually true that 7-Zip can now update over the old copy? That hasn’t worked for me before – have to manually uninstall the old one before installing the new one. Otherwise I get both versions listed in Apps (Win10), but uninstalling one breaks the other – so back to square 1 anyway.

  3. Dwight Stegall said on May 20, 2018 at 12:51 pm

    Bandizip is much better. It takes half the time to archive my files with .7z and makes each archive smaller.

  4. buck0 said on May 7, 2018 at 9:58 pm

    I imagine there are also security concerns with other software that implement parts of 7-Zip with EXE and DLL?

    1. Martin Brinkmann said on May 7, 2018 at 10:03 pm

      Yes I guess you are right. PeaZip was just updated to reflect the change.

  5. yogaisevil said on May 5, 2018 at 6:00 pm

    Okay… I see an ironic worthless reply with zero substance. I love the internet.

  6. Cianoz said on May 3, 2018 at 10:42 am

    I’ve used 7zip for years since I replaced it with BandiZip
    Also tried PeaZip some time ago, but I prefer BandiZip. It’s “smart extract” feature that creates a folder for extracted files and delete the original archive automatically makes it worth to use it even without any other feature.

  7. FFrank said on May 2, 2018 at 8:58 pm

    win10 spring update with comodo here : comodo reports it as malware…

  8. Ben said on May 2, 2018 at 2:52 pm

    Do you really have to restart the PC or logout the user? -.-
    Otherwise it won’t overwrite the dll.

  9. Lazlo said on May 2, 2018 at 7:56 am

    Or you could link to the official site:


    1. ams said on May 2, 2018 at 7:37 pm

      Thanks for posting the site link, but it is sensible for an article describing a product update to link directly to the changelog. In case it escaped your attention, that same link to the official site link is provided on the 7-zip “project summary” page, just one-click-away from the changelog page linked by the article.

  10. Richard Allen said on May 2, 2018 at 12:48 am

    As luck would have it I had updated to 18.04beta a few days ago. Maybe I should try and be more patient, at least it seems to be working well but will update again to 18.05.

    I’ve never felt the need to look at anything else, 7-Zip does everything I need.

  11. yogaisevil said on May 1, 2018 at 6:15 pm

    I see they finally added SSL to the site back in march but 7zip is still an unsigned executable! No doubt the developer could get support from the OSS community.

    1. yogaisevil said on May 1, 2018 at 6:21 pm

      It’s 2018 and people still install none-signed-by-the-author binary code.

      Peazip is has no SSL and is not signed either.

      Y’all lax on security on a tech blog, crazy.

      1. Richard Allen said on May 2, 2018 at 3:57 am

        Okay. I see condescension, ridicule and complaining but no resolution? No alternatives? Excellent. ;)

  12. intelligencia said on May 1, 2018 at 5:14 pm

    . . . and This comment about PeaZip from 2015:

    Rob L. said on August 20, 2015 at 9:36 am

    While 7Zip is a fine utility, I’m glad to see PeaZip getting mentioned in the comments section. You’ve all maybe overlooked some of PeaZip’s best, and most useful, features. The author of PeaZip is a big advocate of encryption, and has included many relevant tools in PeaZip. It is much more than a simple compression/archive utility. It supports two-factor (password AND keyfile) authentication before decryption, and can even generate keyfiles for you using randomized data if you wish. There is much more than i can list here. There’s also extensive support for batch scripting and processing, secure file deletion (any file, not just compressed archives), management of ISO/UDF disk images, and the feature set goes on and on. I highly recommend it to anyone and everyone, it is an incredibly useful application. It’s FOSS at it’s best!

    1. Stefan said on May 2, 2018 at 12:36 am

      Didn’t that contain the malware OpenCandy for a while to ? Yes, bundled by the creator of PeaZip. I sure still avoid software that have been bundled with malware – even if it is just once….can’t trust creators that have done or do this !

  13. intelligencia said on May 1, 2018 at 5:10 pm

    Hi Everyone and a Special Thank You to Mr. Brinkmann and contributors to this site!
    (a donation to http://www.ghacks.net will be forwarded to keep this website going and moving forward)

    I Love Peazip!
    I have used it for years on/off and has never given me any issues.


  14. Yuliya said on May 1, 2018 at 2:23 pm

    First thing I install on any PC. Just updated from 18.01

  15. Paul(us) said on May 1, 2018 at 10:59 am

    I still do not understand (or reading over it) or this version will also work with the WinRar 5.50 introduced new packing (September 3, 2013) format 5.0, with the higher compression?

    And will this latest 7-zip file archive program work with the now any moment released WinRar 5.60 version?

    1. Martin Brinkmann said on May 1, 2018 at 11:00 am

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