CVE-2026-8328

Details

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.

Affected Packages

Python

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1703)Windows 10 (1709)Windows 10 (1803)

Fixed in:

3.13.143.14.63.15.0b2

References

FIX

https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f

FIX

https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06

FIX

https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0