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ALSA-2026:19019 — Important: python3.14 security update

Affected: AlmaLinux:10: python3.14, AlmaLinux:10: python3.14-debug, AlmaLinux:10: python3.14-devel, AlmaLinux:10: python3.14-freethreading, AlmaLinux:10: python3.14-freethreading-debug, AlmaLinux:10: python3.14-freethreading-devel, AlmaLinux:10: python3.14-freethreading-idle, AlmaLinux:10: python3.14-freethreading-libs, AlmaLinux:10: python3.14-freethreading-test, AlmaLinux:10: python3.14-freethreading-tkinter and 4 more

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

* cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865) * cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297) * cpython: Incomplete control character validation in http.cookies (CVE-2026-3644) * cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224) * python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519) * python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502) * python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100) * python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786) * python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-07164

BELL-CVE-2026-0865

Affected: Alpaquita:23: python3, Alpaquita:25: python3, Alpaquita:stream: python3, BellSoft Hardened Containers:23: python3, BellSoft Hardened Containers:25: python3, BellSoft Hardened Containers:stream: python3

BIT-libpython-2026-0865 — wsgiref.headers.Headers allows header newline injection

Affected: Bitnami: libpython

User-controlled header names and values containing newlines can allow injecting HTTP headers.

certfr-2026-avi-0067 — De multiples vulnérabilités ont été découvertes dans CPython. Certaines d'entre elles permettent à un attaquant de prov…

certfr-2026-avi-0067

EUVD-2026-274036

fkie_cve-2026-0865

User-controlled header names and values containing newlines can allow injecting HTTP headers.

GHSA-5mc7-p6pj-r3f5

User-controlled header names and values containing newlines can allow injecting HTTP headers.

OESA-2026-1356 — python3 security update

Affected: openEuler:24.03-LTS: python3

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces. Security Fix(es):

When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues.

This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet.

The attached patches DOES NOT make the base64-decode behavior raise an error…

openSUSE-SU-2026:10200-1 — python310-3.10.19-4.1 on GA media

python310-3.10.19-4.1 on GA media

RHSA-2026:21275 — Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update

python: Quadratic complexity in os.path.expandvars() with user-controlled template cpython: Out-of-memory when loading Plist glib: GLib: Buffer underflow in GVariant parser leads to heap corruption glib: Integer Overflow in GLib GIO Attribute Escaping Causes Heap Buffer Overflow cpython: Header injection via newlines in data URL mediatype in Python firefox: thunderbird: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing cpython: Header injection in http.cookies.Morsel in Python cpython: wsgiref.headers.Headers allows header newline injection in Python python: Python: HTTP header injection via CR/LF in proxy tunnel headers p11-kit: NULL dereference via C_DeriveKey with specific NULL parameters cpython: CPython: Logging Bypass in Legacy .pyc File Handling cpython: Incomplete control character validation in http.cookies cpython: Stack overflow parsing XML with deeply nested DTD content models python: Python: Command-line option injection in webbrowser.open() via crafted URLs python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API libcap: libcap: Privilege escalation via TOCTOU race condition in cap_set_file() python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules systemd: systemd: Arbitrary code execution or Denial of Service via spurious IPC API call data openssl: openssl: Information Disclosure f…

RLSA-2026:19176 — Important: python3.14 security update

Affected: Rocky Linux:9: python3.14

Security Fix(es):

* cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)

* cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

* cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

* cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

* python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)

* python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

* python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

* python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

* python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:0590-1 — Security update for python

Security update for python

UBUNTU-CVE-2026-0865

Affected: Ubuntu:Pro:14.04:LTS: python2.7, Ubuntu:Pro:14.04:LTS: python3.4, Ubuntu:Pro:14.04:LTS: python3.5, Ubuntu:Pro:16.04:LTS: python2.7, Ubuntu:Pro:16.04:LTS: python3.5, Ubuntu:Pro:18.04:LTS: python2.7, Ubuntu:Pro:18.04:LTS: python3.6, Ubuntu:Pro:18.04:LTS: python3.7, Ubuntu:Pro:18.04:LTS: python3.8, Ubuntu:Pro:20.04:LTS: python3.8 and 7 more

User-controlled header names and values containing newlines can allow injecting HTTP headers.

WID-SEC-W-2026-0209 — Cpython: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Cpython ausnutzen, um Dateien zu manipulieren oder beliebigen Code auszuführen.