BIT-LIBPYTHON-2026-8328 FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address

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 getpeername0, ftpcp still calls parse227 directly and passes the raw attacker-controllable IP address and port t...

CVE-2026-8328 FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address

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 getpeername0, ftpcp still calls parse227 directly and passes the raw attacker-controllable IP address and port t...