🛡️ OESA-2026-2920 — python3

python3 security update

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):

tarfile.extractall() with the 'data' or 'tar'

filter could be bypassed by a crafted archive where a hardlink

references a symlink stored at a deeper name than the hardlink itself. 

The extraction fallback validated the symlink at it's archived location

but recreated it at the hardlink's shallower

path, letting a relative

target the filter judged contained escape the destination directory. 

This allowed a malicious tar archive to create a symlink pointing

outside the destination, enabling out-of-destination file reads or

writes. This was an incomplete fix of CVE-2025-4330.(CVE-2026-11940)

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.(CVE-2026-11972)

The ftpcp() function in Lib/ftplib.py was not updated when

CVE-2021-4189 was fixed. While makepasv() was patched to replace

server-supplied PASV host addresses with the actual peer address

(getpeername()[0]), ftpcp() still calls parse227() directly and passes

the raw attacker-controllable IP address and port to target.sendport(). This patch is related to CVE-2021-4189.(CVE-2026-8328)