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Fedora 43 pyOpenSSL Important Security Fix CVE-2026-40475 2026-bc62ef0a6a

fedora
Calendar Grey May 6, 2026
Dist Fedora Esm H88
Update on pyOpenSSL 26.1.0 for Fedora 43 addressing significant security issues and enhancing cryptography support.
Update to pyOpenSSL 26.1.0 This update adds support for cryptography v47 and fixes a single security issue: Fixed X509Name field setters to correctly pass the value length to OpenS...

Summary

High-level wrapper around a subset of the OpenSSL library, includes among others

* SSL.Connection objects, wrapping the methods of Python's portable

sockets

* Callbacks written in Python

* Extensive error-handling mechanism, mirroring OpenSSL's error codes

Update Information:

Update to pyOpenSSL 26.1.0 This update adds support for cryptography v47 and fixes a single security issue: Fixed X509Name field setters to correctly pass the value length to OpenSSL. Previously, values containing NUL bytes would be silently truncated, causing a divergence between the stored ASN.1 value and the value visible from Python. Credit to BudongJW for reporting the issue. CVE-2026-40475

Topics%20covered

Topics Covered

security advisory security issue fedora access control important python

Change Log

* Wed Apr 29 2026 Jeremy Cline - 26.1.0-1 - Update to 26.1.0

References

Fedora Update Notification FEDORA-2026-bc62ef0a6a 2026-05-06 16:45:18.195727+00:00 Name : pyOpenSSL Product : Fedora 43 Version : 26.1.0 Release : 1.fc43 URL : https://pyopenssl.readthedocs.org/ Summary : Python wrapper module around the OpenSSL library Description : High-level wrapper around a subset of the OpenSSL library, includes among others * SSL.Connection objects, wrapping the methods of Python's portable sockets * Callbacks written in Python * Extensive error-handling mechanism, mirroring OpenSSL's error codes

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-bc62ef0a6a' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
important
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Name: pyOpenSSL
Product: Fedora 43
Version: 26.1.0
Release: 1.fc43
URL: https://pyopenssl.readthedocs.org/
Summary: Python wrapper module around the OpenSSL library

Topics%20covered

Topics Covered

security advisory security issue fedora access control important python

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