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Add support for OpenSSL 4.0.0 final #148600

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1 of 1 issue completed
Closed
Add support for OpenSSL 4.0.0 final#148600
1 of 1 issue completed
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extension-modulesC modules in the Modules dirtopic-SSLtype-featureA feature request or enhancement

Description

@vstinner
vstinner
opened on Apr 15, 2026

OpenSSL 4.0.0 final was released yesterday (April 14th, 2026). We should updated the _ssl module to support this new version.

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  1. vstinner
    added
    extension-modulesC modules in the Modules dir
    topic-SSL
    on Apr 15, 2026
  2. vstinner
    added 2 commits that reference this issue on Apr 15, 2026

    pythongh-148600: Add Modules/_ssl_data_40.h data

    d1ca206

    pythongh-148600: Add Modules/_ssl_data_40.h data

    7cdbb77

  3. vstinner commented on Apr 15, 2026

    @vstinner
    vstinner
    on Apr 15, 2026
    MemberAuthor

    Python can be built with OpenSSL 4.0.0 using these commands:

    python3 Tools/ssl/multissltests.py --steps=library --base-directory $HOME/multissl --openssl 4.0.0 --system Linux
./configure --with-pydebug --with-openssl=$HOME/multissl/openssl/4.0.0/
LD_LIBRARY_PATH=~/multissl/openssl/4.0.0/lib64/ make

    See also issue gh-148292: test_urllib2_localnet fails with OpenSSL 4.0.0beta1.

    See also PR gh-146217 which added support for OpenSSL 4.0.0 alpha1.

  4. vstinner
    added a sub-issue on Apr 15, 2026
  5. picnixz
    added
    type-featureA feature request or enhancement
    on Apr 15, 2026
  6. vstinner
    added a commit that references this issue on Apr 15, 2026

    gh-148600: Add Modules/_ssl_data_40.h data (#148601)

    70eb56b
  7. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-148600: Add Modules/_ssl_data_40.h data (python#148601)

    9c9582e
  8. hugovk
    added a commit that references this issue on May 4, 2026

    gh-148600: Add OpenSSL 4.0.0 support to test configurations (#149356)

    fc96028
  9. vstinner
    added a commit that references this issue on May 13, 2026

    pythongh-148600: Add OpenSSL 4.0.0 support to test configurations (py…

    c9a39e6

  10. vstinner commented on May 26, 2026

    @vstinner
    vstinner
    on May 26, 2026
    MemberAuthor

    There is no more known issue with OpenSSL 4.0.0. I close this issue.

    I also proposed a backport to the 3.14 branch, but it was decided to no backport yet: #149783.

  11. vstinner
    closed this as completedon May 26, 2026

  12. xnox commented on Sep 12, 2026

    @xnox
    xnox
    on Sep 12, 2026

    Backports of this issue also need:

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