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Fedora 43 Python3.12 Critical Command Injection Security 2026-4e99b7fe5f

fedora
Calendar Grey March 2, 2026
Dist Fedora Esm H88
Critical security fixes for Python 3.12 in Fedora 43 addressing command injection vulnerabilities.
Security fixes for CVE-2026-1299, CVE-2026-0865, CVE-2025-15366 and CVE-2025-15367

Summary

Python 3.12 is an accessible, high-level, dynamically typed, interpreted

programming language, designed with an emphasis on code readability.

It includes an extensive standard library, and has a vast ecosystem of

third-party libraries.

The python3.12 package provides the "python3.12" executable: the reference

interpreter for the Python language, version 3.

The majority of its standard library is provided in the python3.12-libs package,

which should be installed automatically along with python3.12.

The remaining parts of the Python standard library are broken out into the

python3.12-tkinter and python3.12-test packages, which may need to be installed

separately.

Documentation for Python is provided in the python3.12-docs package.

Packages containing additional libraries for Python are generally named with

the "python3.12-" prefix.

Update Information:

Security fixes for CVE-2026-1299, CVE-2026-0865, CVE-2025-15366 and CVE-2025-15367

Topics%20covered

Topics Covered

security advisory fedora critical command injection CVE python3

Change Log

* Fri Feb 6 2026 Tom\u0161 Hrn\u010diar - 3.12.12-4 - Security fixes for CVE-2026-0865, CVE-2025-15366 and CVE-2025-15367

References


[ 1 ] Bug #2431627 - CVE-2025-15366 python3.12: IMAP command injection in user-controlled commands [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2431627 [ 2 ] Bug #2431651 - CVE-2025-15367 python3.12: POP3 command injection in user-controlled commands [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2431651 [ 3 ] Bug #2431830 - CVE-2026-0865 python3.12: wsgiref.headers.Headers allows header newline injection in Python [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2431830 [ 4 ] Bug #2433827 - CVE-2026-1299 python3.12: email header injection due to unquoted newlines [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2433827

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-4e99b7fe5f' 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
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Name: python3.12
Product: Fedora 43
Version: 3.12.12
Release: 4.fc43
URL: https://www.python.org/
Summary: Version 3.12 of the Python interpreter

Topics%20covered

Topics Covered

security advisory fedora critical command injection CVE python3

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