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Fedora 44 pyOpenSSL Important X509Name Field Fix CVE-2026-40475

fedora
Calendar Grey May 6, 2026
Dist Fedora Esm H88
Critical update for Fedora 44 pyOpenSSL addresses X509Name truncation issue, ensuring accurate ASN.1 value persistence.
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 fedora buffer overflow important pyopenssl x509name

Change Log

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

References

Fedora Update Notification FEDORA-2026-05d463c932 2026-05-06 00:48:51.045817+00:00 Name : pyOpenSSL Product : Fedora 44 Version : 26.1.0 Release : 1.fc44 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-2026-05d463c932' 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 44
Version: 26.1.0
Release: 1.fc44
URL: https://pyopenssl.readthedocs.org/
Summary: Python wrapper module around the OpenSSL library

Topics%20covered

Topics Covered

security advisory fedora buffer overflow important pyopenssl x509name

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